Aptitude - Problems on H.C.F and L.C.M - Discussion
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Read more:"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
- Albert Einstein
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| 11. |
Find the lowest common multiple of 24, 36 and 40.
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120 | [B]. |
240 | | [C]. |
360 | [D]. |
480 |
Answer: Option D
Explanation:
2 | 24 - 36 - 40
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2 | 12 - 18 - 20
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2 | 6 - 9 - 10
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3 | 3 - 9 - 5
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| 1 - 3 - 5
L.C.M. = 2 x 2 x 2 x 3 x 3 x 5 = 360.
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Simbu said:
(Sun, Jun 19, 2011 03:04:38 AM)
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| How to solve it? |
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Raviteja said:
(Mon, Aug 22, 2011 04:01:07 PM)
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24=2*2*2*3=(2^3 * 3^1).
36=2*2*2*3*3=(2^3 * 3^2).
40=2*2*2*3*5=(2^3 * 3^1 * 5^1).
For L.C.M take largest power primes
L.C.M=2^3 * 3^2 * 5^1=2*2*2*3*3*5=360. |
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Girika said:
(Tue, Sep 27, 2011 08:25:42 PM)
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| This is wrong. LCM of 24, 36, 40 is 720. |
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