the difference of 2 numbers is 20 and their product is 125
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(a+b) 2-(a-b) 2 = 4 ab
(a+b) 2-20^2 = 4x125
(a+b) 2-400 = 500
(a+b) 2 = 900
a+b=v900 = 30. Ans
(It is assumed)
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