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Nancy is paid $4.00 a week more than Helen. In 11 weeks, Helen earns as much as Nancy does in 10 weeks. What is the weekly wage of each?
Chemicals A,B, and C cost .60, .40, and .80 per gram, respectively. They are mixed so that the number of grams of B is twice the number of grams of A and B is twice the number of grams of A and is 3 less than the number of grams of C. The mixture is worth $11.40. How...
Julie and Eric row their boat (at a constant speed) 63 miles downstream for 7 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 9 hours. Find the rate of the current.
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