Question 1
In 8 years, Allison will be twice as old as Julia was 3 years ago. If Julia is 17 now, how old is Allison now?
In 8 years: Allison=Allison(now)+8, Julia was 17-3=14 three years ago. Allison(now)+8=2*14 => Allison(now) = 2*14 - 8 = 20.