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A number is divisible by both 7 and 16. ...

A number is divisible by both 7 and 16. By which other number will that number be always divisible?

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Factors of 5 = 1,5
Factors of 12 = 1, 2, 3, 4, 6, 12
5 and 12 are co-primes, and we know that if a number is divisible by two co-primes, then it is a known fact that it is also divisible by their product.
The product of 5 and 12 is 60. Hence, the number is always divisible by 60. Therefore, if a number is divisible by both 5 and 12, it will be divisible by 60.
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