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M24-01

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Math Expert
Joined: 02 Sep 2009
Posts: 55228

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16 Sep 2014, 01:20
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Difficulty:

5% (low)

Question Stats:

93% (00:30) correct 7% (01:00) wrong based on 123 sessions

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If $$x$$ and $$y$$ are positive integers and $$f(x,y)$$ denotes the smallest positive integer divisible by both $$x$$ and $$y$$, then what is the value of $$f(24,36)$$ ?

A. 64
B. 72
C. 96
D. 144
E. 256

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Math Expert
Joined: 02 Sep 2009
Posts: 55228

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16 Sep 2014, 01:20
Official Solution:

If $$x$$ and $$y$$ are positive integers and $$f(x,y)$$ denotes the smallest positive integer divisible by both $$x$$ and $$y$$, then what is the value of $$f(24,36)$$ ?

A. 64
B. 72
C. 96
D. 144
E. 256

Notice that $$f(x,y)$$ represents the least common multiple (LCM) of $$x$$ and $$y$$.

Now, since $$24=2^3*3$$ and $$36=2^2*3^2$$, then the least common multiple of 24 and 36 is $$2^3*3^2=72$$.

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Joined: 08 Jun 2015
Posts: 424
Location: India
GMAT 1: 640 Q48 V29
GMAT 2: 700 Q48 V38
GPA: 3.33

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07 Apr 2018, 09:00
+1 for option B. Take the LCM.
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Re: M24-01   [#permalink] 07 Apr 2018, 09:00
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