<PRE><B>Question 73141</B>
How many kg of water must be evaporated from 50kg of a 10% salt solution to obtain a 15% salt solution?
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Amt of water in 10% solution = 0.90*50kg = 45kg
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Let amt of water evaporated be &quot;x&quot; kg.
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Amt of water in 15% solution = 0.85(50-x)=(42.5-0.85x)kg
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EQUATION:
water - water = water
45 - x= 42.5-0.85x
2.5=0.15x
x= 6 2/3 kg (amt of water that must be evaporated)

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Cheers,
Stan H.</PRE>