Question 141290
let x=Tom and y=father


"Five years ago, Tom was one third as old as his father was then" __ 3(x-5)=y-5 __ 3x-15=y-5 __ 3x-10=y


"In 5 years, Tom will be half as old as his father will be then" __ 2(x+5)=y+5 __ 2x+10=y+5 __ 2x+5=y


substituting __ 3x-10=2x+5 __ x=15


substituting __ 2(15)+5=y __ 35=y