SOLUTION: Hi How much water must be added to 1 litre of a 5% solution of saline to get a 2% saline solution. Thanks

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Question 1192842: Hi
How much water must be added to 1 litre of a 5% solution of saline to get a 2% saline solution.
Thanks
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
%281%2A0.05%29%2F%281%2BQ%29=0.02

5%2F%281%2BQ%29=2

1%2F%28Q%2B1%29=2%2F5

2Q%2B2=5
2Q=3
highlight%28Q=1.5%29

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Problem can be solved in a quicker way.