Categories

# [Smart Math] Ratio Proportion Problem 14

Here’s and example of a SMART MATH problem for RATIO PROPORTION.

### Problem

The ratio of the number of boys and girls in a school 432 students is 5 : 4. How many new girls should join the school so that the ratio becomes 1 : 1?

1. 16
2. 48
3. 62
4. 244
5. 320

### The Usual Method

The number of boys in the school = $\frac{5}{5+4}\times 432=240$

The number of girls in the school = $\frac{4}{5+4}\times 432=192$

For the ratio of boys and girls to become 1 : 1, the number of new girls that join the school should be = 240 – 192 = 48

(Ans: 2)

Estimated Time to arrive at the answer = 45 seconds.