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GCD and LCM

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Source: — Data Sufficiency |
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by g.shankaran » Sun Jun 05, 2011 1:51 am
Please correct me if my understanding/calculation is wrong

1. GCD 10 - Insufficient
2. lcm 180 - insufficient.

1 & 2 - GCD is 10 - so both x and y has 10 in common

lcm 180 - 3 x 3 x 2 x 2 x 5

so the xy = 3 x 3 x 2 x 2 x 5 x 2 x 5 = 1800
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by Frankenstein » Sun Jun 05, 2011 1:56 am
g.shankaran wrote:Please correct me if my understanding/calculation is wrong

1. GCD 10 - Insufficient
2. lcm 180 - insufficient.

1 & 2 - GCD is 10 - so both x and y has 10 in common

lcm 180 - 3 x 3 x 2 x 2 x 5

so the xy = 3 x 3 x 2 x 2 x 5 x 2 x 5 = 1800
Hi,
Correct.
The product of any two numbers X and Y is always equal to the product of their LCM and GCD.
Cheers!

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by cans » Sun Jun 05, 2011 2:07 am
product of 2 numbers =GCD * LCM
xy=10*180 = 1800
IMO C
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Cans!!
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by vikram4689 » Sun Jun 05, 2011 3:26 am
Your understanding is correct and you may derive the formula but this is a standard formula so just learn it ;)
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by aftableo2006 » Mon Jun 06, 2011 8:48 pm
the value of xy is 1800 so C is the answer
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