Latest SSC Aptitude Question SOLUTION: LCM of two prime numbers x and y(x>y)is 161.The value 3y-x is : (a)-2 (b)-1 (c)1 (d)2

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(#M40012754) SSC Numerical Ability question HCF and LCM Keep an EYE

LCM of two prime numbers x and y(x>y)is 161.The value 3y-x is :
(a)-2
(b)-1
(c)1
(d)2

Asked In SSC HARDIKKUMAR PATEL (11 years ago)

Unsolved Read Solution (6)

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Read Solution (6) :

kishore   (11 years ago)

answer is -2. by hit and trial.. x=23 and y=7

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MIR FIROJ ALI  (11 years ago)

As both are prime numbers it's obvious xy=161
so, x=23 and y=7 as x>y
so, 3y-x=3x7-23=-2(Ans).

Is this solution Helpfull? Yes (4) | No (1)  

Mani kandan  (9 years ago)

Answer: A) -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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kamlesh  (11 years ago)

Ans is -2) Because 23x7=161
so x=23 and y=7, 3x7-23=-2.

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Pawan Ahuja  (11 years ago)

23 and 7 ans is -2

Is this solution Helpfull? Yes | No (3)  

Satya B  (9 years ago)

-2
the lcm of 7 & 23 is 161
3(7) - 23= -2

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