Discussion
An evaporator is fed 1000 kilograms per hour of a 5 per cent salt solution and produces a 25 per cent product. How much water is evaporated?
Answer: D
Correct answer: 800 kilograms per hour
The salt is the tie component, since all of it leaves in the product: \[ 1000\times0.05 = 50\ \mathrm{kg/h\ salt}, \qquad \frac{50}{0.25} = 200\ \mathrm{kg/h\ product}, \] so the water evaporated is \( 1000-200 = 800 \) kg/h. Working from the salt rather than the water is what makes this a one-line calculation.
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