Previously asked mathematics question solved

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Previously asked maths questions from numbers for competitive exams

This type of questions often seen in competitive exams, try it...

1. Difference of 2 number is 11 and their product is 60, find the sum of numbers  ?

If you try to solve this question without using equation, it will consume too much time.. so use this equation..

(X + Y)2 = (X - Y)2 + 4 XY

We have     X-Y = 11  and  XY = 60 


(X + Y)2 = 112 + 4 x 60

(X + Y)2 = 121 + 240

(X + Y)2 =  361

X + Y = 19

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