SOLUTION: Molly is 4 years younger than Heidi. In 3 years, Heidi will be twice as old as Molly. How old are they now?

Algebra ->  Expressions-with-variables -> SOLUTION: Molly is 4 years younger than Heidi. In 3 years, Heidi will be twice as old as Molly. How old are they now?      Log On


   

Question 367295: Molly is 4 years younger than Heidi. In 3 years, Heidi will be twice as old as Molly. How old are they now?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
MOLLY'S AGE NOW X-4
HEIDI'S AGE NOW=X
IN 3 YEARS MOLLY WILL BE X-4+3 OR X-1
IN 3 YEARS HEIDI WILL BE X+3
2(X-1)=(X+3)
2X-2=X+3
2X-X=3+2
X=5 YEARS OLD FOR HEIDI NOW.
5-3=2 YEARS OLD FOR MOLLY NOW.
PROOF:
2(5-1)=(5+3)
2*4=8
8=8