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A boat travels downstream at 37 miles per hour. The same boat travels upstream at 17 miles per hour.
The grocer has peanuts for $3.75 a pound and walnuts for $2.75 a pound. How much of each must we mix to get 40 pounds of mixture to sell for $3.00 per pound?
A pot contains 6 L of brine at a concentration of 120 g/L. How much of the water should be boiled off to increase the concentration to 200 g/L?
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