ami is 8 years older than her sisiter,ceanne. in four years ami will be twice as old as ceanne. what is the sum of their ages now?
Now:
Ceanne : x
Ami : x+8
In four years:
Ceanne : x+4
Ami :x+8 + 4 = x+12
but in 4 years
Ami is twice as old as Ceanne ---> x+12 = 2(x+4)
solve