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1)

Two numbers differ by 5. If their product is 336, then the sum of the two numbers is :


A) 21

B) 28

C) 37

D) 51

E) 56

Answer:

Option C

Explanation:

Let the numbers be x and y. Then, xy=5 and xy=336.
(x+y)2=(xy)2+4xy
=25+4×336=1369
x+y=1369=37.