Question

For which pair of courses is the number of boys the same?

• A. E, F
• B. A, D
• C. C, F
• D. B, D
• E. None of these

Answer 1

The correct option is C C, F

Number of boys in course E
= 12% of 1200 - 14% of 800
= 144 - 112 = 32
In course F = 13% of 1200 - 14% of 800
= 156 - 12 = 44
In course A = 20% of 1200 - 30% of 800
$=240-240=0$
In course D = 35% of 1200 - 30% of 800
= 420 - 240 = 180
In course C = 5 % of 1200 - 2% of 800
= 60 - 16 = 44
Obviously pair C and F is our answer.