A person washes eight cars in eighteen minutes. At this rate how many cars he can wash in three hours?
Answer: 80
Explanation
Let's break it down:
Cars washed in 18 minutes = 8
Cars washed per minute = 8 / 18
To find cars washed in 3 hours (180 minutes):
Cars washed in 180 minutes = (8 / 18) * 180
= 8 * 10
= 80
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