How Much water must be evaporated from 100 gallons of a 10% brine solution to get a 20% brine solution?

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Original solution: 100 gallons of 10 percent brine solution Let x = number of gallons of water to be evaporated(to get 80 percent water and 20 percent brine): .9(100) - x = .8(100 - x)90 - x = 80 - .8x.2x = 102x = 100x = 50