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Question
there are 75 envelops in a package. how many envelops are there in 7 packages?
A) 552
B) 10r2
C) 525
D)625
Krissy,
The answer is given by 75 times 7.
This is because you have seven packages, each having 75 envelops.
We can do this using mental arithmetic, I suppose...
75*7 is the same as (70+5)*7.
We can take this as 70*7 + 5*7.
Knowing the seven times-table,
7*5 is 35,
7*7 is 49.
So, 70*7=490. Adding this to 5*7, we get
75*7
= (70+5)*7
= 70*7+5*7
= 490+35
= 525
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Answers by Expert:
Josh
Expertise
When I work through problems, I like to emphasize concepts which I believe are worth noting. I will try to answer questions in the following areas, but not at the advanced level. Algebra. Sequences & Series. Trigonometry. Functions & Graphs. Coordinate Geometry. Quadratic Polynomials. Exponential & Logarithms. Basic Calculus. Probability, Permutation and Combination. Mathematical Induction. Complex numbers. Physics problems.
Experience
I have worked as a teaching assistant in college. My hope is that more people will share knowledge without boundary, give help without seeking recognition or monetary rewards.
Education/Credentials
Bachelor degree in Engineering Science
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