alleryStart learning →If the HCF of two numbers is 9 and their LCM is 90, and one number is 18, the other number is
A45
B30
C81
D10
Answer & Solution
Correct answer: A. 45
1. Product of the numbers = HCF × LCM = 9 × 90 = 810.
2. Other number = 810 ÷ 18 = 45.
3. So the other number is 45.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch8 'Real Numbers', §8.3 (HCF·LCM = product)_
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