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Q.
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.
83
B.
89
C.
85
D.
79
View Answer
Correct choice: C
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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