There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
The odd composite numbers lower than 30 are:9 15 21 25 27
21 22 24 25 26 27 28
composite numbers 30-40
11, 13, 17, 19, 23, 29 are the primes between 10 and 30 so the composite numbers are all the others. 12,14,15,16,18,20,21,22,24,25,26,27,28, and 30 are the composite numbers between 10 and 30.
There are 18 that are less than 30.
There are 15 composite numbers greater than 50 but less than 70
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
It is a ratio of 5:13
The odd composite numbers lower than 30 are:9 15 21 25 27
All of them except 31 and 37 which are prime numbers
31 ( they are : 4,6,9,10,12,14,15, 16,18,20,21,22,24,25,26,27, 28, 30, 32,33,34,35,36,38,40,42,44,45,46,48,49)
9, 15, 21, 25, 27
21 22 24 25 26 27 28
None. All counting numbers are even or odd.
composite numbers 30-40