Question

One year ago liz was three times as old as her brother jack. in two years she'll be only twice as old as jack. how old are liz and jack now?

Answer 1

now she is x,one year ago,she is x-1,he is 1/3(x-1),in two years,she is x+2,he is 1/2(x+2)
we can get
1/3(x-1)+3=1/2(x+2)
x=10