Super composite number?
Number Theory
Level
1
My friend's house number has a very interesting property in that it is divisible by 8, 10, 12, and 14.
This same number must also be divisible by which of the following?
9
11
13
15
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1 solution
If the number is divisible by 10, it must be divisible by 5. If the number is divisible by 12, it must be divisible by 3.
If a number is divisible by both 3 and 5, it must be divisible by 3 × 5 = 1 5