Question: The last time Bob cut his hair he cut it to 6 inches. His hair is now 36 inches long. If hair grows at a rate of .5 inches per month how many years did it take him to grow out his hair? Think carefully first, then make a decision:
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His hair grew 36 inches - 6 inches = 30 inches. Hair grows at a rate of 12 months / year * 0.5 inches / month = 6 inches / year. It took him 30 inches / 6 inches / year = 5 years to grow his hair out. So the answer is 5.
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