Question

Jim is 9 years old and Katy is 6 years younger than jim, in how many years will Jim be twice as old as Katy

Answer 1

Katy : 8 - 6 = 3 years old
After o years
9+o = 2(3+o)
4.5+0.5o = 3+o
0.5o = 1.5
o = 3
so the answer is in 3 years