in a library the ratio of story books and other books is 7 : 2 and there are 1512 story books. due to collection of some more books the said ratio becomes 15 : 4. The number of story books collected is?
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Let initially other books were x.∴72=1512x⇒x=2×15127=2×216=432Let number of story books collected be y.∴1512+y432=154⇒6048+4y=6480⇒4y=6480−6048⇒4y=432∴y=108
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