Question

Carol received an 82, 94, and 88 on three Social Studies tests.What did Carol receive on her fourth test if her average on all four tests was 85?

Answer 1

`76`

Explanation:

You can propose a simple equation, by knowing that the average is the sum of all the list of numbers divided by the number of numbers.

We define x as the score of the four test since we don't know it:
`(82+94+88+x)/4=85`
The left side is how you calculate the average and the right side is the result that you already know (85).
Solving for x:
`x=(85*4)/(82+94+88)=76`