A student who secures 20 % marks in an examination fails by 30 marks. Another student who secures 32 % marks gets 42 marks more than those required to pass. The percentage of marks required to pass is:________?

A. 20%
B. 25 %
C. 28%
D. 30%

Explanation:

20 % of x + 30 = 32 % of x – 42

Or 12 % of x = 72.

So, x = (72 ×100)/12 = 600

Pass marks = 20 % of 600 + 30 = 150

Pass Percentage =[1/4 x 100]%= 25 %