Question

There are 21 students in a class. The ratio of the number of boys to the number of girls is 4:3. How many girls are in the class?

Answer 1

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Total students in the class=21

Number of boys to number of girls=4:3

Let 4x be number of boys and 3 x be number of girls.

4x+3x=21

7x=21

x=21/7

x=3

Number of boys=4x=4×3=12

Number of girls=3x=3×3=9

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