Question

A student obtain 75%, 80% and 85% in three subjects. If the marks of another subject are added then his average cannot be less then

(a) 60%

(b) 65%

(c) 80%

(d) 90%

Answer 1

The correct option (a) 60%

Explanation:

Total marks of 3 subject = 75 + 80 + 85 = 240 out of 300 at least average marks ≥ 240 out of 400.

Considering worst case possibility, mark of fourth subject = 0

Average of marks ≥ (240/400) × 100 = 60%

∴ Average will always be more than 60%.