SOLUTION: How many kg of water must be evaporated from 50kg of a 10% salt solution to obtain a 15% salt solution? This was given to me out of a GEPA math tutorial book.

Question 73141: How many kg of water must be evaporated from 50kg of a 10% salt solution to obtain a 15% salt solution?
This was given to me out of a GEPA math tutorial book.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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 "x" 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.
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