SOLUTION: Age Problem How would you write this as an equation? Nina is currently three times as old as her sister Tina. In four years, Nina will only be twice as old as Tina. How old is

Algebra ->  Inequalities -> SOLUTION: Age Problem How would you write this as an equation? Nina is currently three times as old as her sister Tina. In four years, Nina will only be twice as old as Tina. How old is      Log On


   



Question 682742: Age Problem
How would you write this as an equation?
Nina is currently three times as old as her sister Tina. In four years, Nina will only be twice as old as Tina. How old is each girl?

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
Nina is currently three times as old as her sister Tina.
let x be Nina’s age and y Tina’s age
currently x=3y.....eq. 1
In four years, Nina will only be twice as old as Tina.

x%2B4=2%28y%2B4%29.....eq. 2.....plug in x=3y

3y%2B4=2%28y%2B4%29....solve for y
3y%2B4=2y%2B8
3y-2y=8-4
y=4.......Tina’s current age
x=3y...=>...x=3%2A4...=>...x=12......Nina’s current age