The composite numbers that are between 1 and 20 inclusive are:
4 6 8 9 10 12 14 15 16 18 20
This is a total of eleven composite numbers equal to 20 and below.
There are 15 composite numbers greater than 50 but less than 70
There are 18 that are less than 30.
74
1260 of them.
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
The sum of the composite numbers that are less than 8 is: 4+6 = 10
composite numbers are less than 12: 4, 6, 8, 9, 10
There are 18.
Five.
24
49 of them.
Three of them.