Sum of two numbers is 25 and their differenee is 13. Find their product _____ ?

– by 0

A. 315
B. 325
C. 114
D. 104

Let the numbers be x and y. Then, x + y = 25 and x – y = 13.
4xy = (x + y)2 – (x – y)2 = (25)2 – (13)2 = 625- 169 = 456
=> xy = 114.

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