Question

In a school, the ratio of the number of boys to the number of girls is 4:5. When 100 girls leave
the school the ratio becomes 6:7. Find the number of boys in the school.
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Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

hiii I hope it's helpful for you. ...

Step-by-step explanation:

first solution: -

In a school ratio of boys to girls is 4:5. when 100 girls leave the school ratio becomes 6:7.

How many boys are there in the school?

:

let x = the multiplier

then

4x = original number of boys

and

5x = original number of girls

:

 = 

Cross multiply

7(4x) = 6(5x-100)

28x = 30x - 600

600 = 30x - 28x

600 = 2x

x = 600/2

x = 300 is the multiplier

then

4(300) = 1200 boy.

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