2005 AMC 12A Problem 4
Problem 4 of 25EasierCounting & Probability
A store normally sells windows at each. This week the store is offering one free window for each purchase of four. Dave needs seven windows and Doug needs eight windows. How many dollars will they save if they purchase the windows together rather than separately?
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Solution
Buying separately, Dave gets windows by paying for (), and Doug gets by paying for (), for a total of
Buying together, they need windows: paying for yields free, for a cost of
The savings are
Thus, the correct answer is A.