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Question

The HCF of 3240, 3600 and a third number is 36, and their LCM is 24×35×52×72. The third number is

A
24×53×72
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B
22×35×72
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C
23×35×72
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D
25×52×72
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Solution

The correct option is B 22×35×72
3240=23×34×5;3600=24×32×52

HCF = 23×32

LCM = 24×35×52×72

Since HCF is the product of lowest powers of
common factors third number should have
23×32 as factor
LCM is the product of the highest powers of all
factors therefore third number should
have 35×57 as its factors
Third number = 22×35×72

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