Final answer:
To evaluate the expression [(12+8) : 2] x 2, simplify the expression inside the parentheses, divide, and then multiply.
Step-by-step explanation:
To evaluate the expression [(12+8) : 2] x 2, we follow the order of operations, which is parentheses, exponents, multiplication and division (from left to right), and addition and subtraction (from left to right).
First, we simplify the expression inside the parentheses: 12+8 = 20.
Then, we divide 20 by 2 to get 10. Finally, we multiply 10 by 2 to get the final answer of 20.