1.

Find thee ratio between the LCM and HCF of 5,15 and 20.

Answer»

Let's find prime factors of 5, 15 & 20   

5 = 5

15 = 3 × 5  

20 = 2 × 2 × 5  

LCM = 5 × 2 × 2 × 3  = 60  

HCF = 5  

Ratio = LCM/HCF 

= 60 / 5  

= 12 /1  

= 12 : 1



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