Question

11. Calculate the ratio between the LCM and HCF of the numbers 5, 15 and 20. (a) 5:3 (b) 7:2 (c) 9:4 (d) 12:1​

Answer 1

Answer:

LCM (5, 15, 20) = 2∣5,15,202∣5,15,103∣5,15,55∣5,5,5∣1,1,1

LCM = 2×2×3×5=60

5=1×5

15=3×5

20=2×2×5

So, HCF (5, 15, 20)=5

HCFLCM=560=12

answer is 12:1