A sporting goods store carries only yellow and white golf balls. At the beginning of the day it had 600 golf balls in stock, and by the end of the day it had sold 80% of its inventory of golf balls. If the store sold an equal number of yellow and white golf balls, and in doing so sold all of its white golf balls, how many yellow golf balls did the store have to begin the day?
Correct answer: E
Explanation
Since the store sold an equal number of white and yellow balls, 80%/2 = 40% of the inventory at the start of the day was white balls. Then 60% of the inventory consisted of yellow balls.
0.6(600) = 360
The answer is E.
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AQuA-RAT items are crowdsourced algebra problems, not ACT questions. They carry five answer choices in the pre-2025 ACT Mathematics style and no ACT reporting category. Useful for drilling Preparing for Higher Math content; not a substitute for a real form.