Marianne must score an average of at least 80 points on 4 tests before she can apply for the scholarship. If she scored 79, 81, and 77 for the first three tests, what must she score on her last test

Question

She has to score an 80 average and she has a 79 81 and 77 what does she need to score

Answer 1

in order to achieve an average of at least 80 points in 4 tests she has to score 4 x 80 = 320 pionts

she has scored until now , three tests a total of 79 + 81 + 77 = 237 points so she needs 320 - 237 = 83 points

at least for the 4th test.