in a school ,4/5 of the students are boys ,and the number of girls is 100 .find the no of boy.
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I guess the number of boys are 400
atique:
answer is 400
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let the total number of students be "a"
no of girls are 100
so, 4/5 of "a" are boys
we can write the no of girls as = total students - boys (a - 4/5 a)
a - 4/5 a = (5a - 4a)/5
=a/5
100 = a/5
a = 100 x 5
a = 500
total no of students - no of girls = no of boys
a - 100 = boys
500 - 100 = 400
no of girls are 100
so, 4/5 of "a" are boys
we can write the no of girls as = total students - boys (a - 4/5 a)
a - 4/5 a = (5a - 4a)/5
=a/5
100 = a/5
a = 100 x 5
a = 500
total no of students - no of girls = no of boys
a - 100 = boys
500 - 100 = 400
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