Question:`x/y = m/n` একটি সমানুপাত এবং m ; n = 12 : 13

 `(x + m)/(y + n)`এর মান কোনটি? 

A `(21)/(31)` 
B `(13)/(12)` 
C `(12)/(13)` 
D 13 

+ Answer
C 

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Irin Moni

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