AboutWei Chong Expertise I can help you out with topics such as Algebra, Fractions, Exponents and Graphs. I'll guide you in solving math problems using logical step-by-step explanations.
Experience I was a part time tutor for 5 years tutoring students in many subjects including mathematics.
Education/Credentials Bachelor degree in Electrical Engineering,
A-levels
Question 1penny plus 2 pennies plus 3pennies upto 1 dollar is ???
1penny plus 2 pennies plus 3pennies upto 2 dollars is ???
1penny plus 2 pennies plus 3pennies upto 3 dollars is ???
1penny plus 2 pennies plus 3pennies upto 4 dollars is ???
1penny plus 2 pennies plus 3pennies upto 5 dollars is ???
Answer Hi Rhonda,
Let's take the first example:
1 penny plus 2 pennies plus 3 pennies up to 1 dollar (100 pennies) is ?
We can interpret this question as:
1 + 2 + 3 +....+ 100
Where we are to find the sum of all the pennies.
If you look carefully, the above expression is a sum of a series, the formula to calculate the sum is given as:
Sum = n(n+1)/2 where n = number of terms (n must be even)
So, for the expression above,
Sum = 100(100+1)/2
= 50(101)
= 5050
As for 1penny plus 2 pennies plus 3 pennies up to 2 dollars
(1 + 2 + 3 + ..... + 200)
