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Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is:

A.	75	B.	81
C.	85	D.	89

Answer and Explanation

Answer:85

Explanation:
Since the numbers are co-prime, they contain only 1 as the common factor.
Also, the given two products have the middle number in common.
So, middle number = H.C.F. of 551 and 1073 = 29;
First number = 551 / 29 = 19; Third number = 1073/ 29 = 37.

Required sum = (19 + 29 + 37) = 85.

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