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

Correct Answer: -2

Explanation:

 H. C. F of two prime numbers is 1.  Product of numbers = 1 x 161 = 161.


 Let the numbers be a and b . Then , ab= 161.


 Now, co-primes with  product 161 are (1, 161) and (7, 23).


 Since x and y are prime numbers and x >y , we have x=23 and y=7.


 Therefore,  3y-x = (3 x 7)-23 = -2


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