Answers

2015-02-17T19:56:20+05:30
Here, 
2472 = 2*2*2*3*103
1284 = 2*2*3*107
N = 2*2*3*X
(2,2,3 are common values and should product with X)
H.C.F= 2*2*3= 12
L.C.M = 2*2*3*X*2*103*107 (N* remaiing values from 2472 and 1284)
we know the value of lcm and solve to find X
you get 15
Now, N= 180
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