SOLUTION: 70% of salt solution was diluted with water to produce 50liters of 55% salt solution.How much water was used?

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Question 687410: 70% of salt solution was diluted with water to produce 50liters of 55% salt solution.How much water was used?
Answer by lwsshak3(11628) About Me  (Show Source):
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70% of salt solution was diluted with water to produce 50liters of 55% salt solution.How much water was used?
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let x=amt of water used
50-x=amt of 70% solution used
70%(50-x)=55%*50
35-.7x=27.5
.7x=7.5
x≈39.29
amt of water used≈39.29 liters