Problems on H.C.F and L.C.M - Arithmetic Aptitude Questions and Answers

Home / Arithmetic Aptitude / Problems on H.C.F and L.C.M :: Discussion

The LCM of two prime number x and y is 161. If x>y, find the value of 15y-7x.

-32

-56

Answer : Option B

Explanation :

Note: The HCF of two prime numbers = 1

LCM/HCF =161/1 =161
161=7 * 23
The ratio of numbers: 7: 23
Hence, the expression gives15 * 7 - 7 * 23 = -56

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