Allison burns 10 calories per minute when she works out on the treadmill. How many calories will she burn after she has used it for three-quarter of an hour?
a. 175
b. 225
c. 450
d. 540
Answer : c
In order to solve this problem the student must realize that three-quarters of an hour is equivalent to 45 minutes. Therefore, if Allison burns 10 calories per minute and the questions is asking how many calories she can burn in 45 minutes, then we must multiply the 10 calories that she burns per minute by the 45 minutes as follows:
10 calories/minute x 45 minutes = 450 calories (It is important to note at this time that the units for minutes disappear and we are left with only calories which is what is required)
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