The LCM of two numbers is 30 and their HCF is 5. One of the numbers is 10. The other is:

The LCM of two numbers is 30 and their HCF is 5. One of the numbers is 10. The other is:
[A]20
[B]15
[C]5
[D]25

15
Because, First number \times Second number = LCM \times HCF
Let the Second Number be x.
∴ 10x = 30 \times 5
=>x=\frac{30\times 5}{10}=15
Hence option [B] is the right answer.

Originally written on June 16, 2016 and last modified on June 29, 2016.
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