Question

This is probably pretty easy, I could solve all the other ones but I got stuck on this one.

Answer 1

78

Explanation:

Let x be the score on the next test

We are averaging 6 tests and want an average of 75

( 82+91+38+78+83+x) /6 = 75

Multiply each side by 6

( 82+91+38+78+83+x) = 75*6

( 82+91+38+78+83+x) =450

Combine like terms

x+372 = 450

Subtract 372 from each side

x+372-372 = 450-372

x =78