Question

For course D, what is the respective ratio of boys and girls?

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

Answer 1

The correct option is A 3 : 4

For course D,
Number of girls = 30% of 800
$=\frac{30\times 800}{100}=240$
Number of students
$=35\times \frac{1}{100}\times 1200=420$
$\therefore$ Number of boys = 420 - 240 = 180
$\therefore$ Required ratio = 180 : 240 = 3 : 4