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 than

• A. 60%
• B. 65%
• C. 80%
• D. 90%

Answer 1

Answer: (A)

60%

Answer 2

Marks obtained from 3 subjects out of 300

=$75 + 80 + 85$= $240$

If the marks of another subjected is added, then the marks will be $\geq$ 240 out of 400

∴ Minimum average marks $= \frac{240}{4} = 60\%$,

[When marks in the fourth subject = 0].