Q

### a boy was asked to find the LCM of 3, 5, 12 and another number.But while calculating, he wrote 21 instead of 12 and yet came with the correct answer . what could be the fourth number?

3 , 0 , 0 , under Brain Teasers , added 8 years, 4 months ago
6 years, 5 months ago
As the problem is stated now, there are a lot of possibilities... To make it a little bit more challenging, you may want to find the smallest one ;-)

A

the LCM of 3,5,12 is 60.the LCM of 3,21,5 is 105.The LCM of 60 and 105 is 420.

So the fourth number is 420

2 , 0 0 for Q. a boy was asked to find the LCM of 3, 5, 12 and... answer added by V.S.Janani 8 years, 4 months ago

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Hotmail is the second most used emailing service behind Google’s Gmail, with more than half a billion users worldwide. Start hotmail login account now. 1 , 0 0 for Q. a boy was asked to find the LCM of 3, 5, 12 and... answer added by abrahamlincoln 3 weeks, 3 days ago

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Hotmail is the second most used emailing service behind Google’s Gmail, with more than half a billion users worldwide. Start hotmail login account now. 1 , 0 0 for Q. a boy was asked to find the LCM of 3, 5, 12 and... answer added by abrahamlincoln 3 weeks, 3 days ago

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Hotmail is the second most used emailing service behind Google’s Gmail, with more than half a billion users worldwide. Start hotmail login account now. 1 , 0 0 for Q. a boy was asked to find the LCM of 3, 5, 12 and... answer added by abrahamlincoln 3 weeks, 3 days ago

A

LMC ( 3, 5, 12, 21 ) = 420

fourth number: 420 / (3 * 5) = 28

LCM ( 3, 5, 12, 28 ) = 420 LCM ( 3, 5, 21, 28 ) = 420

1 , 0 0 for Q. a boy was asked to find the LCM of 3, 5, 12 and... answer added by Janosik 6 years, 5 months ago