Answer:
9 years old
Step-by-step explanation:
let Allen's age be n then Erica is n + 7
In 5 years their ages will be
n + 5 and n + 7 + 5 , also
n + 7 + 5 = 2(n + 5)
n + 12 = 2n + 10 ( subtract n from both sides )
12 = n + 10 ( subtract 10 from both sides )
2 = n
Thus Allen is 2 and Erica is 2 + 7 = 9 years old
