The strength of a class is 55. The ratio of boys to girls is 9:2. Find the number of boys in the class

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Solution

The correct option is A
45

Strength of a class = 55

Ratio of boys to girls = 9 : 2

let the number of boys = 9x

Then, the number of girls = 2x

Strength of the class = 55

9x + 2x = 55

11x = 55

x = $\frac{55}{11}$

Number of boys = 9x

= 9 $\times$ 5

= 45

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The strength of a class is 55. The ratio of boys to girls is 9:2. Find the number of boys in the class

The correct option is A 45 Strength of a class = 55 Ratio of boys to girls = 9 : 2 let the number of boys = 9x Then, the number of girls = 2x Strength of the class = 55 9x + 2x = 55 11x = 55 x = 5511 Number of boys = 9x = 9 × 5 = 45

The correct option is A
45

Strength of a class = 55

Ratio of boys to girls = 9 : 2

let the number of boys = 9x

Then, the number of girls = 2x

Strength of the class = 55

9x + 2x = 55

11x = 55

x = $\frac{55}{11}$

Number of boys = 9x

= 9 $\times$ 5

= 45