Question

How many integer between 20 and 40 divisable by 3

Answer 1

7 integers

Explanation:

We can find how many integers between 20 and 40 are divisible by 3 by looking at the multiples of 3 that lie between 20 and 40.

1: 3 * 7 = 21

2: 3 * 8 =24

3: 3 * 9 = 27

4: 3 * 10 = 30

5: 3 * 11 = 33

6: 3 * 12 = 36

7: 3 * 13 = 39

Answer 2

4 prime numbers all divisible by 3

Explanation:

there are 4 prime numbers between 20 and 40 23, 29, 31, 37 all divisible by 3