There are 15 composite numbers greater than 50 but less than 70
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
Three of them.
There are 18.
Five.
24
there are 4. 11,13,17,19
2
There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
All of them except for 23 which is a prime number
74
1260 of them.
There are 18 that are less than 30.