jim has grades of 84 ,65,and 76on threemath tests . what grade must he obtain on the next test to have an average of exactly 80 for the four tests

Question

whpalmer4 · Answer

If the tests are all worth the same amount, then the average will be

(test1 + test2 + test3 + test4)/4

because there are 4 tests.  You know tests 1-3, and you know the average score you want.  Write the simple equation and solve for test4.

whpalmer4 · Answer

What does Jim need to score to have an overall average of 80?