Five.
There are 18.
there are 4. 11,13,17,19
All of them except for 23 which is a prime number
74
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
There are 15 composite numbers greater than 50 but less than 70
Three of them.
24
Five.
There are 18.
There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
2
there are 4. 11,13,17,19
All of them except for 23 which is a prime number
75 composite numbers are there till 100. 100-25=75. Composite numbers are numbers greater than 1 but not prime numbers.
1260 of them.