If it takes 5 identical firetrucks 5 minutes to pump 5 kiloliters of water onto a fire, how long will it take 8 firetrucks pump 8 kiloliters? Hint: the answer isn't 8 minutes.

If they were to work together, how many days will it take for them to craft 6 guitars?

If 5 hens need 5 days to hatch 5 eggs, how many days would it take 100 hens to hatch 100 eggs?

Note: the actual radius of the earth and moon are approximately 6368 km and 1738 km, respectively.

7th graders' average height for the girls is 54 inches. The average height for the boys is 55 inches. If the ratio of girls to boys is 7 to 6, what is the average height of all the students?

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