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Six grapefruit cost as much as a dozen oranges. The cost of a dozen grapefruit and two dozen oranges is $12.00. How much does one grapefruit cost?

When the temperature goes up three degrees on the Cantor scale, it goes up eight degrees on the Frobenius scale. On both scales, 18 degrees is the same temperature. How many Frobenius degrees are equal to 30 degrees Cantor?

A soft-drink vendor at a popular beach analyzes his sales records, and finds that if he sells x cans of soda pop in one day, his profit (in dollars) is given by: P(x) = -0.001x^2 + 3x - 1800 What is his maximum profit per day, and how many cans must he sell for...