What is the sum of the first four composite numbers? 19 20 27 28

Composite number is a number that have factor other than 1 or the number itself. It is the opposite of prime number. Then to solve this question it will be easier to make this list

2= 2 *1 = prime
3= 3 *1 = prime
4= 2 *2 = composite
5= 5 *1 = prime
6= 2 *3 = composite
7= 7 *1 = prime
8= 2 *2 * 2 = composite
9= 3 *3 = composite

then 4 first composite is: 4+6+8+9= 27

Your answer is 27 :)