SOLUTION: At most, how much water can be evaporated from 300 liters of a 2% salt solution if the resulting solution is not to exceed 3% in salt content?

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Question 408729: At most, how much water can be evaporated from 300 liters of a 2% salt solution if the resulting solution is not to exceed 3% in salt content?
Found 2 solutions by stanbon, robertb:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
At most, how much water can be evaporated from 300 liters of a 2% salt solution if the resulting solution is not to exceed 3% in salt content?
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Equation:
water - water = water
0.98*300 - 1x = 0.97(300-x)
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Multiply thru by 100 to get:
98*300 - 100x = 97*300 - 97x
3x = 300
x = 100 liters (amt. of water to evaporate)
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Cheers,
Stan H.
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Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.02%2A300+-+0.00x+%3C=+0.03%2A%28300+-+x%29
6+%3C=+9+-+0.03x
0.03x+%3C=+3
x+%3C=+100
Hence at most 100 L of water must be evaporated.