Question

in a school 5/8 of the students are boys . if there are 240 girls , find the number of boys in school

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Answer 1

Answer:400

Step-by-step explanation:

If total no of students =x

Then 3x÷8=no of girls

ie 3x÷8=240

×=640

Therefore no of boys=640×5/8

=400

Answer 2

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Let the total no. be x

given no. of girls =240

i.e,

$total no. of boys =x-240\\ x=\frac{5}{8}x\\x=\frac{(x-240)\times8}{5}\\ \frac{8x-1920}{5}=x\\8x-1920=5x\\3x=1920\\x=640$

hence total no. of boys

=5/8×640

=0.625×640=400

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