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ICSE Class X Math 2017 Paper

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Question : 18 of 31
Marks: +1, -0
If   7m+2n7m−2n=  53\;\frac{7 m+2 n}{7 m-2 n}=\;\frac{5}{3}, use properties of proportion to find
(i) m:nm : n
(ii)   m2+n2m2−n2\;\frac{m^2+n^2}{m^2-n^2}
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