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What is the smallest positive integer that is evenly divisible by both

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Bunuel
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What is the smallest positive integer that is evenly divisible by both [#permalink] New post   14 Jan 2019, 04:29
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What is the smallest positive integer that is evenly divisible by both 21 and 9?

A. 189
B. 126
C. 63
D. 42
E. 21
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C
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Re: What is the smallest positive integer that is evenly divisible by both [#permalink] New post   14 Jan 2019, 04:49
Bunuel wrote:
What is the smallest positive integer that is evenly divisible by both 21 and 9?

A. 189
B. 126
C. 63
D. 42
E. 21



start with E, D.

E) 21...........not divisible by 9

D) 42.........Not divisible by 9.

C) 63..............7*9 = 63 and 21*3 = 63.


C is the correct answer.
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Re: What is the smallest positive integer that is evenly divisible by both [#permalink] New post   14 Jan 2019, 05:15
Going through options from bottom,

21 and 42 are not divisible by 9.

63 is divisible by both 9 and 21

OPTION: C
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Re: What is the smallest positive integer that is evenly divisible by both [#permalink] New post   14 Jan 2019, 18:57
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Bunuel wrote:
What is the smallest positive integer that is evenly divisible by both 21 and 9?

A. 189
B. 126
C. 63
D. 42
E. 21


Since the LCM of 21 and 9 is 3^2 x 7 = 9 x 7 = 63, we see that 63 is the smallest positive integer divisible by both 21 and 9.

Answer: C
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Re: What is the smallest positive integer that is evenly divisible by both [#permalink] New post   20 Nov 2019, 05:38
The Answer is the LCM of (21,9) = 63

Ans C
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Re: What is the smallest positive integer that is evenly divisible by both [#permalink] New post   16 Jan 2020, 09:44
Bunuel wrote:
What is the smallest positive integer that is evenly divisible by both 21 and 9?

A. 189
B. 126
C. 63
D. 42
E. 21


21 = 3*7
9 = 3*3

We need 3*3*7=63

Answer C
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Re: What is the smallest positive integer that is evenly divisible by both [#permalink]
16 Jan 2020, 09:44
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