Question

Riley is 3 years older than his sister. The sum of their ages if s represents Riley's sister's age is shown as

A. 3s
B. b s + 3
C. 2(s + 3)
D. 2s + 3

Answer 1

The algebraic expression that represents this is D. 2s + 3.

Riley's sister - s
Riley - s+3
Total - s+s+3 = 2s+3
Total - 2s + 3.