Question

In a class percentage of girls is 40%. If there are 30 boys then number of girls is​

Answer 1

Answer:

20 girls is the answer

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Answer 2

$\sf{\bold{\green{\underline{\underline{Given}}}}}$

• % of girls = 40%
• No. of boys = 30

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$\sf{\bold{\green{\underline{\underline{To\:Find}}}}}$

• No. of girls = ??

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$\sf{\bold{\green{\underline{\underline{Solution}}}}}$

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Total percentage = 100%

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% of girls = 40%

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% of boys = Total - %age of girls

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% of boys = 100 - 40

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% of boys = 60%

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• let the total number of students be x

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$\sf:\implies \: {\bold{ 60\% of x = 30}}$

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$\sf:\implies \: {\bold{ \dfrac{60}{100} \times x = 30}}$

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$\sf:\implies \: {\bold{ \dfrac{6}{10} \times x = 30}}$

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$\sf:\implies \: {\bold{ x =\dfrac{30\times 10}{6}}}$

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$\sf:\implies \: {\bold{ x = 5\times 10}}$

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$\sf:\implies \: {\bold{ x = 50}}$

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Total number of students = 50

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No. of girls = Total students - No. of boys

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No. of girls = 50 - 30

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No. of girls = 20

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$\sf{\bold{\green{\underline{\underline{Answer}}}}}$

• Total number of girls in the class are 20