SOLUTION: Erin's age is 3 times Warren's. In 4 years she will be twice as old as he will be. How old is each now? Help, thank you.

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Question 170690: Erin's age is 3 times Warren's. In 4 years she will be twice as old as he will be. How old is each now?
Help, thank you.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Let e = Erin's age now
Let w = Warren's age now
;
Write an equation for each statement:
:
"Erin's age is 3 times Warren's."
e = 3w
:
" In 4 years she will be twice as old as he will be."
e + 4 = 2(w+4)
Simplify
e + 4 = 2w + 8
e = 2w + 8 - 4
e = 2w + 4
;
How old is each now?
:
Substitute 3w for e in the above equation
3w = 2w + 4
3w - 2w = 4
w = 4 yr is Warrens age now
:
I'll let you find Erin's age now
:
Check your solutions in the statement:
"In 4 years she will be twice as old as he will be."