Solve each problem. See the strategy for problem solving.
STRATEGY Problem Solving
1. Read the problem as many times as necessary to get an understanding of the problem.
2. If possible, draw a diagram to illustrate the problem.
3. Choose a variable, write down what it represents, and if possible, represent any other unknown quantities in terms of that variable.
4. Write an equation that models the situation. You may be able to use a known formula, or you may have to write an equation that models only that particular problem.
5. Solve the equation.
6. Check your answer by using it to solve the original problem (not just the equation).
7. Answer the question posed in the original problem.
Salt Solution II Suppose the 5-gallon solution in the previous problem is contained in a 5-gallon container. The chemist plans to remove some amount of the 0.2 pound per gallon solution and replace it with 0.5 pound per gallon solution so that he ends up with 5 gallons of a 0.3 pound per gallon solution. What amount should he remove?
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