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Two numbers are in the ratio 3 : 4 and their HCF is 5.
What is their LCM?

Class 6HCF and LCMPlaying with Numbers

A54
B60
C66
D120

Step-by-Step Solution

If HCF is 5 and ratio is 3:4, numbers are 15 and 20. LCM(15,20):

15 = 3 \times 5, 20 = 2^{2} x 5

, LCM =

2^{2} x 3 x 5 = 60

.

Answer: B) 60

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