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no.11.
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here is your answer!!!
given => X - Y = 12
Xy = 25/4
to find :- X + y = ?
using this identify we can get answer
( x-y ) ² = ( x + y ) ² - 4 xy
now. putting the Value we get ,
( 12 )². = (x + y )² -4 * 25/4
144 + 25 = ( x + y )²
√ 169 = x +y
hence , X + y = 13
hope it helps you dear!!!
thanks