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The HCF of two numbers is 6 and their LCM is 72. If one number is 18, what is the other number?

A12
B36
C48
D24
Answer & Solution
Correct answer: D. 24
The product of the two numbers equals HCF x LCM = 6 x 72 = 432, so the other number is 432 / 18 = 24.
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