Question 1033069
A = B+10
A+7 = 2(B+7)
B+10+7 = 2(
B+17 = 2B+14
B+3 = 2B
3 = B
Brandon is 3 and Ashley is 3+10 = 13.
In 7 years Ashley will be 13+7=20 
and Brandon: 3+7 = 10. So Ashley is 2x10 = 20 just like the problem says.