multiples of 3 ... 21, 24, 27, 30 (between means leave out 30
multiples of 6 ... 24, 30
so the answer is 24
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They are 24, 30 and 36
Three of them.
Multiples of 5 are not prime numbers except 5, so there are none. But, there are prime numbers between 20 and 40, like 23, 29, 31 and 37.
The numbers are: 1 and 20
The numbers 16 and 20 are both multiples of 4. This means that both 16 and 20 can be divided evenly by 4 without leaving a remainder. In mathematical terms, we can say that both 16 and 20 are divisible by 4.