Question

Jillian and Sara are sisters. Jillian is older than Sara by 3 years.

Which of the following algebraic expressions could represent Jillian's age?

1. s-3

2. 3s

3. s+3

4. s/3

5. 3/s

Which one is correct?

Answer 1

Let's represent Jillian's age with j and Sara's with s.

• j must be 3 more than s, so j = s+3
• then s= j-3