Question

In an examination out of 80 students, 85% of the girls and 70% of the boys passed. How many boys appeared for the examination if the total pass percentage is 75%?

• A. 370
• B. 340
• C. 320
• D. 360
• E. None of the above

Answer 1

The correct option is C 320


By Alligation rule:
$\frac{Numberofboys}{Numberofgirls}=\frac{10}{5}=\frac{2}{1}$
Total number of students =480
Number of boys $=\frac{480\times 2}{3}=320$