Question

3. A student has earned the following scores on four 100-point tests

Answer 1

In order to have average 80 score from 5 tests, student needs to have 400 points (80%*500=0.8*500=400)

So far he has 63+72+88+91= 314

400-314=86

He needs to get 86 points from the last test.

Since he is obviously getting better at tests, i think he'll manage :)