51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88
Five.
There are 18.
there are 4. 11,13,17,19
All of them except for 23 which is a prime number
74
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.
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.