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LCM and HCF

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  1. Four numbers are in the ratio of 10 : 12 : 15 : 18. If their HCF is 3, then find their LCM.
    1. 420
    2. 540
    3. 620
    4. 680
    5. None of the above
Correct Option: B

Let numbers be 10N, 12N, 15N and 18N.
Then, LCM = 180N and HCF = N
Hence, required LCM = 180 x 3 = 540


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