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Question
In a school, `4/5` of the students are boys, and the number of girls is 100. Find the number of boys.
Solution
Let the total number of boys and girls = x
Total number of boys = `4/5` of x = `(4"x")/5`
According to question, the total strength of the school,
`"x"-(4"x")/5=100`
`(5"x"-4"x")/5=100`
`"x"/5=100`
⇒ x = 500
∴ Number of boys = total strength − girls
= 500 − 100
= 400.
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