Question

There are 20 boys and 25 girls in a class. If 5 girls are added to the class, what is the new ratio of number of boys to the girls?

• A. 4 : 5
• B. 1 : 1
• C. 2 : 3
• D. 3 : 2

Answer 1

The correct option is C 2 : 3

Currently, the ratio of number of boys to the number of girls
$=20:25$

If 5 girls are added, the new ratio will be
$20:(25+5)=\frac{20}{30}=\frac{10\times 2}{10\times 3}=2:3$

The new ratio will be 2 : 3.