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All numbers divisible by both 4 and 15 are also divisible by what numbers?
a number is 6. All numbers divisible by both 4 and 15 are the multiples of 4 and 15. Since 4 and 15 have no prime factor in common (4 = 22, 15 = 3 · 5), then the least common multiple of 4 and 15 is equal to their product, namely 4 · 15 = 60. Every other multiple of 4 and 15 is divisible by 60. Thus, if 60 is divisible by a number then all the multiples of 4 and 15 are divisible by that number. Therefore, it is enough to check by which number in the given options is 60 divisible. Only 6 divides 60 and none of the other do. The answer must be (A).
Why is 15 not a prime number?
15 is not a prime number because it is not only divisible by 1 and itself it is also divisible by 3.
What is the number that is divisible by 1-15?
16
What is the greatest common factor for 15 and 26?
1 15 is only divisible by 1, 3, 5 and 15 26 is only divisible by 1, 2, 13 and 26
What does it mean for a number to be divisible by another number?
That means that if you perform a division sum with the number and its factor, the result would be an integer. For example, 15 is divisible by 1, 3, 5 and 15. 15/3 = 5, 15/5 = 3.
