Explanation

Let's solve the expression step by step following BODMAS/BIDMAS (Brackets, Orders, Division/Multiplication, Addition/Subtraction) rules:

18 - 6 / 2 + 4 * 3

1. Division first:
   6 / 2 = 3
   Expression becomes: 18 - 3 + 4 * 3

2. Multiplication next:
   4 * 3 = 12
   Expression becomes: 18 - 3 + 12

3. Now, solve from left to right:
   18 - 3 = 15
   15 + 12 = 27