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Relation between HCF and LCM

Question 37 L...

Question

Question 37
LCM of 10, 15 and 20 is

(A) 30
(B) 60
(C) 90
(D) 180

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Solution

Prime factorisation of 10, 15 and 20 is:

LCM of 10, 15 and 20= $2^{2} \times 3 \times 5 = 60$

Therefore the required LCM is 60.

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Question 38
LCM of two numbers is 180. Then which of the following is not the HCF of the numbers?

(A) 45
(B) 60
(C) 75
(D) 90

80, 10, 30, 70, 60, 50, 50, 40, 40, 20, 40, 90, 50, 30, 70, 10, 60, 50, 20, 70, 70, 30, 80, 40, 20, 80, 90,

50, 80, 60, 70, 40, 50, 60, 90, 60, 40, 40, 60

60

160

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