Question: Running for 2 hours, Jonah burnt 30 calories every hour. How many more calories would he have lost if he would have run for five hours? Think carefully first, then make a decision:
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When Jonah ran for 2 hours, burning 30 calories every hour, he burnt a total of 2 * 30 = 60 calories. If he had run for five hours, losing 30 calories every hour, Jonah would have burnt 5 * 30 = 150 calories. The difference in the number of calories Jonah would have burnt if he ran for five hours instead of 2 hours is 150 - 60 = 90 calories. So the answer is 90.
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