Question

20% of boy of school absent.if 180boy were absent.find number of boy in school

Answer 1

let the number of boys be x

now number of boys absent

= 20% of x

= 20x/100

ATQ

20x/100 = 180

x = 180 x 100/20

x = 900

total number of students = 900

Answer 2

Let total boys be x.
Then, 20% of x =180
20x/100= 180
x= 900
Total boys=900

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