in a public school 1 5 th of the girls and..., Percentage, General Mathematics

Question:In a public school, `1/5 th` of the girls and `1/4 th` of boys are under `12` years of age. If the total strength of the school is `1000` and number of girls is `2/5 th` of the total, what part of the total strength of the school is accounted for by those which are `12` years or more of age ?

A `23%` 
B `45%` 
C `55%` 
D `77%`

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+ AnswerD

+ ExplanationGirls` = (2/5 xx 1000)`

`= 400,` Boys `= 600`

Under `12` years 

`= (1/5 xx 400 + 1/4 xx 600)`

`= 230`

Above `12` years 

`= (1000 - 230)`

`= 770.`

Required percentage 

`= (770/1000 xx 100)%`

`= 77%`.

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