Question
$\frac{7}{2 x+1}+\frac{13}{y+2}=27 ; \frac{13}{2 x+1}+\frac{7}{y+2}=33$
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Age in years
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$0-10$
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$10-20$
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$20-30$
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$30-40$
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$40-50$
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No. of persons
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$5$
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$25$
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?
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$18$
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$7$
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