Multiple Choice Questions

L C M of two prime numbers x and y x gt y is 161 The value of 3y ndash x is ........

Quantitative Aptitude( Paper-I ) LCM, HCF

L.C.M. of two prime numbers x and y (x > y) is 161. The value of 3y – x is:

-2

-1

Make the factors of 161.
161 = 23×7.
So 23 and 7 are the required numbers.
And x > y.
So x = 23 and y = 7.
3y – x = 21 – 23 = -2

Hence, option 1 is the correct answer.

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