Question

The marks obtained by a student in two tests were 70 and 75. Find the minimum marks he should get in the third test to have an average of at least 60 marks.

Answer 1

Let the third test mark be x.

`(70 + 75 + x) / 3 ≥ 60`

145 + x ≥ 180

x ≥ 35

So the student must score at least 35 marks on the third test.