Maintaining an 80% aqverage

Question

A student scores 71 out of 100 on a test. If the maximum score on the next test is also 100? points, what score does the student need to maintain at least an average of 80??

Answer 1

Since there are only 2 tests in this problem,

 

80 = (71 + x) / 2

 

x = 160 - 71 = 89

 

The student needs a score of 89.