SSC
Government Jobs Exams
Numerical Ability
LCM and HCF
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
Read Solution (Total 6)
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- answer is -2. by hit and trial.. x=23 and y=7
- 12 years agoHelpfull: Yes(6) No(4)
- 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).
- 12 years agoHelpfull: Yes(4) No(1)
- 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 - 9 years agoHelpfull: Yes(2) No(0)
- Ans is -2) Because 23x7=161
so x=23 and y=7, 3x7-23=-2. - 12 years agoHelpfull: Yes(1) No(3)
- 23 and 7 ans is -2
- 12 years agoHelpfull: Yes(0) No(3)
- -2
the lcm of 7 & 23 is 161
3(7) - 23= -2 - 9 years agoHelpfull: Yes(0) No(0)
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