Six
Five.
There are 18.
Less than.
Just count them - there are not THAT many of them.
Twelve numbers exactly are greater than 76 and less than 89.
There are 15 composite numbers greater than 50 but less than 70
The prime numbers that are greater than 80 and less than 100 are 83, 89, and 97.
Infinitely many.
3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
109 whole numbers greater than 9 and less than 999 are multiples of 9
24
25
Six
Five.
There are 18.
24 of them.