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A professor gives a test, and the scores range from 40 to 80. The professor decides to scale the test in order to make the scores range from 60 to 90. Let "x" represent an original score, and let "y" represent a converted score.

Suppose you have a lemonade stand, and when you charge $1 per cup of lemonade, you sell 60 cups. But when you raise your price to $2, you only sell 30 cups. Write an equation for the number of cups you sell as a function of the price you charge. Denote "C" for number...

A room is 12m long and 8m broad. Find the cost of carpeting it at the rate of Rs.6.5/m when the carpet is 75cm broad.