Brody’s calculator can run for 60 hours on a full battery. Brody has used three quarters of its battery up, and he is about to take a two-hour math exam that will require his calculator the whole time. How many hours of battery will Brody’s calculator have left? Let's think first. Chain of thought:
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Brody’s calculator has 60 * 1 / 4 = 60 / 4 = 15 hours of battery left. After his 2 - hour math exam, Brody’s calculator will have 15 - 2 = 13 hours of battery left.
Therefore, the answer is 13.
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