# How Many Girls are There in the Class?

Answered

In a class, the number of boys and girls is in the ratio of 4:5. If 10 more boys join the class, the ratio of numbers of boys and girls becomes 6:5. How many girls are there in the class?

- 20
- 30
- 25
- None of these

Best answer

**Answer: (3) 25 girls**

**Explanation:-**

Let the number of boys 4 X & the number of girls = 5 X

According to the question,

(4 X + 10) /5 X = 6/5

5 x (4 X + 10) = 6 x 5 X

20 X + 50 = 30 X

30 X – 20 X = 50

10 X = 50

X = 50/10

X = 5

Then, the number of girls in the class = 5 X = 5 x 5 = 25.

Hence, the answer is (3) 25 girls.