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08 Jun 2016, 10:08
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D
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Difficulty:
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87% (00:51) correct
13%
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If the least common multiple of two prime numbers x and y is 10, where x > y, then the value of 2x + y is
A. 7
B. 9
C. 11
D. 12
E. 21
A. 7
B. 9
C. 11
D. 12
E. 21
08 Jun 2016, 10:19
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LCM of two prime numbers will basically be multiple of those numbers. LCM = 10 = 2*5, both of which are prime.
Now we know x>y, so x=5 and y =2.
2x+y = 2*5 + 2 = 10 + 2 = 12. Hence D.
Now we know x>y, so x=5 and y =2.
2x+y = 2*5 + 2 = 10 + 2 = 12. Hence D.
General Discussion
08 Jun 2016, 10:30
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Bunuel
If the least common multiple of two prime numbers x and y is 10, where x > y, then the value of 2x + y is
A. 7
B. 9
C. 11
D. 12
E. 21
A. 7
B. 9
C. 11
D. 12
E. 21
Since both are prime numbers there are only two factors for each 1 and the number itself.
LCM of two prime numbers = multiplication of the numbers
10= 2*5 or 5*2
But its given that x>y, hence x=5 and y =2
2x+y= 2*5 +2= 12
D is the answer
