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Solution


Q.

The ratio between the LCM and HCF of 5, 15, 20 is:
1 9 : 1  
2 4 : 3  
3 11 : 1  
4 12 : 1  

Ans.

(4)

We have, 5 = 1 × 5; 15 = 3 × 5 and 20 = 2 × 2 × 5∴ LCM (5, 15, 20) = 3 × 4 × 5 = 60and HCF (5, 15, 20) = 5Therefore, ratio between the LCM and HCF = 60 ÷ 5 = 12 : 1