SOLUTION: Tom had twice as much as lisa. Tom spent $15, lisa had 2/3 of what tom had left. How much did both have altogether at first?

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Question 567881: Tom had twice as much as lisa. Tom spent $15, lisa had 2/3 of what tom had left. How much did both have altogether at first?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Tom had twice as much as lisa. Tom spent $15, lisa had 2/3 of what tom had left. How much did save altogether at first?
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let x=$ lisa had at first
2x=$ Tom had at first
..
(2x-15)*2/3=x
4x-30=3x
x=30
2x=60
ans:
Both altogether at first had $60+$30=$90