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Question
In a school out of 300 students, 70% are girls and 30% are boys. If 30 girls leave and no new boy is admitted, what is the new percentage of girls in the school?
Solution
total number of children in a school = 300
No. of. boys = 30% of 300
`= 30/100 xx 300 = 90`
and no.of.girls = 70% of 300
`= 70/100 xx 300 = 210`
Now no.of girls left = 30
∴ No. of. girls after leaving 30 girls
= 210 - 30 = 180
and No. of. children in the school = 180 + 90 = 270
∴ % of girls now `=180/270 xx 100 = 200/3%`
`= 66 2/3%`
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