Question

Rachel was an 85 average after four test. what does she need to earn on the next test if she wants to raise her average to exactly 88?

Answer 1

she took four tests with one more to take totals 5 tests

 88 x 5 = 440

 all her tests need to equal at least 440 to get an 88 average

since she has 85 average after 4, 85*4 = 340, so her 4 tests so far have equaled 340

440-340 = 100

 she will need to get a 100 on her 5th test to have an 88 average