Canadian Forces Aptitude Test (CFAT) Practice

How can you determine Sam's age using the following expression: subtract seven from twice 21, then add 11, followed by dividing by 2?

1. 20

2. 22

3. 24

4. 23

The correct answer is: 23

To determine Sam's age using the provided expression, we need to break down the operations step by step. First, we start with twice 21: \[ 2 \times 21 = 42 \] Next, we subtract 7 from this result: \[ 42 - 7 = 35 \] Then, we add 11 to the new result: \[ 35 + 11 = 46 \] Finally, we divide the total by 2: \[ 46 \div 2 = 23 \] Thus, through this series of calculations, we arrive at the final result of 23, which represents Sam's age. This step-by-step method shows how each operation contributes to finding the final answer.