SOLUTION: Sam is four years younger than Jo. But in five years time Jo will be twice Sam age now. How old are they now?

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Question 978630: Sam is four years younger than Jo. But in five years time Jo will be twice Sam age now. How old are they now?
Answer by ikleyn(52790) About Me  (Show Source):
You can put this solution on YOUR website!

Let  x  be the Sam's age now.
Then Jo's age now is  x+4,  according to the condition.

In  5  years Jo's age will be  (x+4)+5,  and it is twice  Sam's age now:

(x+4)+5 = 2x.

It gives

x + 9 = 2x,
x = 9.

So,  Sam is  9  years old now.  Jo is  9 + 4 = 13  years old now.

Answer.  Sam is  9  years old now.  Jo  13  years old now.