Question

the ratio of boys and girls in a class is 7:4. if the number of girls 12. what is the total strength of the class 1. 21 2. 9 3. 33 4. 30

Answer 1

Answer:

1.21

ratio of boys and girls = 7:4

no. of girls =12

so, 4×3=12

therefore7×3=21

Answer 2

Answer:

48

Step-by-step explanation:

Let,

The number of boys = 7x and the number of girls =5x.  

According to the condition,  

7x = 5x + 8

2x = 8

x = 4

Therefore The number of boys = 7x = 7 × 4 = 28 and the number of girls =5x = 5 × 4 = 20.

Therefore total strength of the class = 28 + 20 = 48

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