Question

find number which addition is 25 and difference is 13​

Answer 1

$\huge{\mathfrak{\purple{Question}}}$

find number which addition is 25 and difference is 13.

$\huge{\mathfrak{\purple{Answer}}}$

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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