Answer:
10 primes, 19 composites, and 1
Step-by-step explanation:
September has thirty days. Of the numbers 1-30, the following
are prime: 2,3,5,7,11,13,17,19,23,29.
The others are composite, except 1 which is neither!
So, 10 primes, 19 composites, and 1
