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The least number of five digits which is exactly divisible by 12,15 and 18 is:

a)10080 b)10800 c)18000 d)81000

2 Answers

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The LCM of the three numbers is 180.

Now, 180 x 50 is 9000, 180 x 60 is 10800.

So the number has to lie between 10000 and 10800.

Now, 180 x 55 = 9900, 180 x 56 = 10800.

So the answer should be 10800

 180 x 56 is 10080, not 10800.
edited by
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try option A and it is the least among all the options and it is exactly divisible by 12,15 and 18 , for your convenience you can try it with GATE VIRTUAL CALCULATOR , and the logic of try it with LCM of 3 will also work , option elimination will be the best approach here

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