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Two positive integers have HCF 9 and LCM 90. If one number is 18, the other is

A90
B45
C9
D30
Answer & Solution
Correct answer: B. 45
$\text{HCF} \times \text{LCM} = $ product of the two numbers: $9 \times 90 = 18 \times x$, so $x = 810/18 = 45$.
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