Sarah is two-thirds as old as Jenny. Jenny is 7 years older than Sarah. Which system of equations could be used to find the girls’ ages?

A. 3s – 2j = 0
j – 7 = s

B. j = 2/3s
s + 7 = j

C. j – 2/3 = s
j – s = 7

D. 2/3j = s
j + 7 = s

2 answers

and what is your thinking?

i think its D. is that right?