| Subject | Date Asked | Expert |
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| Algebra | 9/21/2007 | Soroban |
Q: a triangle has perimeter 29 cm. The sides have lengths, in centimeters, that are consecutive odd ...
A: Juan! There must be a typo in the problem. The answer don't come out to be integers. ...
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| algebra word problem | 9/20/2007 | Soroban |
Q: nine large pipes will drain a pond in eight hours and six small pipes will drain the same pond in ...
A: Michelle! I had to baby-talk my way through this one . . . 9 Large pipes do the job in 8 hours. ...
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| Problem-solving | 9/20/2007 | Soroban |
Q: I figured this one out, but I am assuming there is a shorter way to arrive at the answer. Please ...
A: Alli! I get TWO possible answers . . . Let M = number of men Let W = number of women Let C = ...
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| Algebra | 9/20/2007 | Soroban |
Q: I'm having trouble with the how to solve the following problem. Please help. 4x-y+2z=11 x+2y-z=-1 ...
A: Sister Kimberly! I would eliminate the y's first. Multiply the first equation by 2: 8x - 2y + 4z ...
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| Math | 9/19/2007 | Soroban |
Q: Going crazy.. 3 people are working on a garden, to make it larger. One says they need to buy more ...
A: Louis! It helps if you know a bit of mathematical trivia. With a given amount of fencing, the ...
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| algebra II - Problem solving with equations. | 9/19/2007 | Soroban |
Q: Jim's weekly pay is 2/3 of Alicia's. Together they earn $600 per week. What is each person's weekly ...
A: Patrick! Let A = Alicia's pay Then: (2/3)A = Jim's pay Together they earn 600: A + (2/3)A = ...
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| Canceled Units | 9/18/2007 | Soroban |
Q: If someone walks for 3 1/2 days for 8 hours per day at 1/2 mile per hour, if my calculations are ...
A: Kenneth! Your work is off . . . It's straight multiplication. >> If someone walks for 3½ days ...
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| algebra word problem | 9/18/2007 | Soroban |
Q: Three consecutive even integers are such that the square of the third is 76 more than the square of ...
A: Phil! >> Three consecutive even integers are such that the square of the third >> is 76 more than ...
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| word problem | 9/18/2007 | Soroban |
Q: Amy leaves Georgia driving at a constant speed. After a while she passes a mile marker displaying a ...
A: JM! What a strange problem! Suppose the first sign had the two-digit number "AB". The value is ...
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| Math word problem | 9/17/2007 | Soroban |
Q: The Game: There are 23 X’s written on the chalkboard. Here are the rules: -On your turn you can ...
A: Celeste! >> The Game: There are 23 X’s written on the chalkboard. >> Here are the rules: >> On ...
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| Math word problem | 9/17/2007 | Soroban |
Q: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 8% cement should ...
A: Sharon! Here's my approach to these "mixture" problems. Consider the amount of cement in the mix ...
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| word problems | 9/14/2007 | Soroban |
Q: a person buys a certain number of cows for rupees 1800 four of them die, he sells the remaining at a ...
A: Anisha! Let N = number of cows he bought. Let p = price per cow he paid. Then: Np = 1800 ¡æ p ...
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| Slope | 9/13/2007 | Soroban |
Q: A local sporting goods store sells treadmills with incline (slope) capabilities. Assume that the ...
A: Kelly! Think of slope as "rise over run" (the vertical rise over the horizontal run). A) A 2% ...
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| math problems | 9/13/2007 | Soroban |
Q: I have 2....What number divided by 2, 3, 4, 5, or 6 has a remainder of 1 but when divided by 7 has ...
A: Stephanie! Let X be the number. Find the LCM of 2, 3, 4, 5, and 6. It is 60. Then X is of the ...
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| Percent | 9/12/2007 | Soroban |
Q: I need help with problems that asks "what is the percent of increase"(percent of is..) I learned in ...
A: Nathan! I'm not sure what you mean by "multiplication and division", but I'm willing to take a ...
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| 3rd grade word problem. | 9/12/2007 | Soroban |
Q: My son received a math problem that I could not figure. There are 7 different train cars. How many ...
A: Carlos! This is quite tricky for 3rd grade. There are 7 different cars. Call them: A, B, C, ...
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| Percent | 9/11/2007 | Soroban |
Q: I need help with problems that asks "what is the percent of increase"(percent of is..) I learned in ...
A: Nathan! Suppose a item originally cost $50. Then (due to inflation) the cost rose to $62. We see ...
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| probality | 9/11/2007 | Soroban |
Q: a bag contains 3 green marbles 5 blue marbles and 7 purple marbles. What is the p(purple, the blue) ...
A: hollywood! There are 15 marbles: 3 Green, 5 Blue, 7 Purple. The probability that the first is ...
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| Question | 9/10/2007 | Soroban |
Q: The cost (c) of selling x calculators in a store is modeled by the equation C = 3200000/x + 60000. ...
A: Joe! We want Profit to be greater than Cost: P > C So we have: 500x > 3,200,000/x + 60,000 ...
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| word problem | 9/10/2007 | Soroban |
Q: Imagine you are in a school that has 1000 lockers all closed. 1000 students then perform the ...
A: JM! I saw this problem only a few years ago. So it is a "new classic". It has to do with the ...
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| physics | 9/9/2007 | Soroban |
Q: Someone in a car going past you at the speed of 48m/s drops a rock from the height of 1.6 m. How ...
A: Alex! The height of the rock at time t is given by: y = 1.6 - 4.9t² The horizontal distance ...
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| word problem help | 9/9/2007 | Soroban |
Q: I need to know how to set this problem up correctly. A truck leaves at 9:00am and travels to WY. ...
A: Maria! Let T = speed of the truck (miles per hour). Let M = speed of the motorcycle (miles per ...
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| algebra 3 word problems | 9/6/2007 | Soroban |
Q: find two consecutive odd integers whose product is 143.
A: Jenna! Let the first odd integer be x. Since odd numbers "go up by two", the next odd intetger ...
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| 5th grade math word problem | 9/6/2007 | Soroban |
Q: The arcade has three pinball machines and five video games. If a person wants to play one pinball ...
A: Stephanie! You're correct . . . it IS multiplication. There are: 3 × 5 = 15 combinations. ~ ~ ...
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| math | 9/6/2007 | Soroban |
Q: simplify expressions using the order of operations [25*(2-3)-2 [2+3)2-4.5]+7
A: Cathy! I'll do the best I can. There seems to be some typos in the problems. >> [25*(2 - 3) ...
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| Probability | 9/5/2007 | Soroban |
Q: Alex and Eric go to the mall parking lot on weekends to see if they can find any loose change. ...
A: Tellisia! This is a strange problem. Is there more information given? Over a year, they found ...
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| quadratic modelling | 9/5/2007 | Soroban |
Q: The driver of a car trevelling downhill on a road applied the brakes. The speed (s) of the kar in ...
A: Max! >> The driver of a car travelling downhill on a road applied the brakes. >> The speed (s) of ...
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| math word problem | 9/4/2007 | Soroban |
Q: lily has been surveying classmates to see which universal studios islands of adventure ride they ...
A: Aaron! If I read the problem correctly, all the facts are there. Hulk and Spiderman had the same ...
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| college algebra word problems | 9/4/2007 | Soroban |
Q: A car radiator has a 6-liter capacity. If the liquid in the radiator is 40% antifreeze, how much ...
A: Jayne! The word "replaced" makes this a tricky one . . . Consider the amount of antifreeze (AF) ...
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| scientific notation | 9/3/2007 | Soroban |
Q: A lake in Minnesota covers an area of about 8.5*10^7 square feet and its average depth is about 32 ...
A: Diante! >> A lake in Minnesota covers an area of about 8.5 × 10^7 ft² >> and its average depth is ...
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| WORD PROBLEM | 9/2/2007 | Soroban |
Q: The combined cost of one advance ticket to a show and one same-day ticket was $55 . It is known that ...
A: Chris! Are you familiar with Systems of Equations? We can solve this with two variables. Let ...
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| alg II/trig | 9/1/2007 | Soroban |
Q: A motorboat traveling across a wide river is headed 50 degrees north of west at a constant speed of ...
A: Brian! I just answered this question at another site. Are you the same person? The vector of ...
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| Algebra | 8/31/2007 | Soroban |
Q: In schools in our area they teach children to solve the following problem using successive trials. ...
A: Ed! Your confusion is understandable. With 3 variables and only 2 equations, we usually can't ...
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| college algebra | 8/31/2007 | Soroban |
Q: A farmer has a rectangular garden plot surrounded by 220 ft of fence. Find the length and width of ...
A: Ana! The perimeter of a garden has two lengths (L) and two widths (W). There are 220 ft of ...
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| Word Problem in Quadratic Equation form re: Construction | 8/30/2007 | Soroban |
Q: A garden area is 30ft long and 20ft wide. A path of uniform width is set around the edge. If the ...
A: Debbie! I hope you can follow my diagram. Draw a rectangle, wider than it is high. Label a ...
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| Time distance problem | 8/30/2007 | Soroban |
Q: OK, it has been a very long time since I've had to do word problems. This was on a job application I ...
A: Nicole! There is a sneaky trick we can use on these 2-vehicle problems. One car is moving east at ...
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| Algebra word problems | 8/30/2007 | Soroban |
Q: On the forst part of a 317-mile trip, a salesperson averaged 58 miles per hour. He averaged only 52 ...
A: Cassandra! We will use: Distance = Speed ¡¿ Time He drove for a total of 5¨ú hours ... 23/4 ...
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| College Algebra | 8/29/2007 | Soroban |
Q: The prices of various items are giving for 1990 and 2002. Find the percent change for each. Gallon ...
A: Cassandra! The amount of change is: $1.36 - 1.16 = $0.20 a 20 cent increase. The percent ...
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| Algebra | 8/29/2007 | Soroban |
Q: 1/2 is not an element of {x|x is a rational number} -- why is this true? (I just don't understand ...
A: Sister Kimberly! That way of writing is sometimes called "set builder" notation. It is a way to ...
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| Clock Time | 8/28/2007 | Soroban |
Q: How many times, in 12 hours, do the second, minute, and hour hand of a clock line up? If you could ...
A: Ben! We can "walk" through this one . . . The three hands are together at 12 noon. They are ...
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