Question

What is the ratio of the boys doing their PG in Mathematics and the number of girls doing their PG in Botany?

• A. 3 : 4
• B. 6 : 1
• C. 5 : 6
• D. 2 : 3
• E. None of these

Answer 1

The correct option is C 5 : 6

Number of boys $=\frac{900\times 5}{9}=500$
Number of girls $=900-500=400$
Zoology,
Girls$=400\times \frac{1}{5}=80$
Boys $=180-80=100$
Statistics,
Girls$=400\times \frac{1}{4}=100$
Boys$=\frac{3}{2}\times 100=150$
Botany,
Boys$=500\times \frac{1}{5}=100$
Girls $=220-100=120$
Mathematics,
Girls $=150\times \frac{1}{3}=50$
Boys $=100$
Physics,
Boys $=50$
Girls $=50$

Required ratio $=100:120=5:6$