General Aptitude - 10.1 Problems on H.C.F and L.C.M - General Questions Free Online Tests | Mock Tests | Preparation | Practice Tests

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General Aptitude
10.1 Problems on H.C.F and L.C.M - General Questions

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What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?

A. 196

B. 630

C. 1260

D. 2520

E. None of the above

View Answer

Correct choice: B

Explanation:

L.C.M. of 12, 18, 21 30                 2 | 12  -  18  -  21  -  30
                                         ----------------------------
   = 2 x 3 x 2 x 3 x 7 x 5 = 1260.       3 |  6  -   9  -  21  -  15
                                         ----------------------------
   Required number = (1260 ÷ 2)            |  2  -   3  -   7  -   5

                   = 630.

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General Aptitude 10.1 Problems on H.C.F and L.C.M - General Questions

General Aptitude
10.1 Problems on H.C.F and L.C.M - General Questions