In a school with 600 students, the average age of the boys is 12 years and that of girls is 11 years. If the average age of all the children in the school is 11 years and 7 months, then what is the number of girls in the school?

350

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300

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250

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200

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150

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Solution

The correct option is C 250
Let the number of boys be x, so the number of girls will be (600-x)
$\frac{12 x + 11 (600 - x)}{600} = 11 \frac{7}{12} \Rightarrow x + 6600 = 6950 \Rightarrow$ No.of boys, x=350 Therefore, number of girls = 250

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Q33. In a public School $\frac{1}{5} t h$ of girls and $\frac{1}{4} t h$ of boys are under 12 years of age. If the total strength of the school is 1000 and number of girls is $\frac{2}{5} t h$ of the total strength of the school. Then the percentage of student of 12 and above 12 years is:

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In a school with 600 students, the average age of the boys is 12 years and that of girls is 11 years. If the average age of all the children in the school is 11 years and 7 months, then what is the number of girls in the school?

The correct option is C 250Let the number of boys be x, so the number of girls will be (600-x) 12x+11(600−x)600=11712⇒x+6600=6950⇒No.of boys, x=350 Therefore, number of girls = 250

The correct option is C 250
Let the number of boys be x, so the number of girls will be (600-x)
$\frac{12 x + 11 (600 - x)}{600} = 11 \frac{7}{12} \Rightarrow x + 6600 = 6950 \Rightarrow$ No.of boys, x=350 Therefore, number of girls = 250