In a class the ratio of boys and girls was 7 to 3. If there were 210 girls in the class, what was the number of boys in the class ?

In a class the ratio of boys and girls was 7 to 3. If there were 210 girls in the class, what was the number of boys in the class ? Correct Answer 63

The ratio of boys and girls is 7 : 3.Let,The number of boys is 7x and the number of girls is 3x.According to the question, 3x = 210 so, x = 70.So, the number of boys is = 7x                                                 = 7 × 70                                                =490.
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