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In a public school 1/5t h or of girls an...

In a public school `1/5t h` or of girls and `1/4t h` of boys are under 12 years of age. If the number of girls is`2/5t h` of the total,what part of the total strength of the school is accounted for by those who are 12 years or more of age? `23 %` b. `45 %` c. `5%` d. `77 %`

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