Choose the answer.

Question

Matthew is 5 years older than twice the age of his sister. If Matthew is 13, how old is his sister?

Question 4 options:

3

4

9

31

Answer 1

Let's let x represent the age of Matthew's sister. The problem tells us that Matthew is 5 years older than twice the age of his sister, so we can write the equation 13 = 2x + 5.
Subtracting 5 from both sides gives us 8 = 2x.
Dividing both sides by 2 gives us x = 4.
Therefore, Matthew's sister is 4 years old.
The answer is 4.