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# News from Mathnasium of Maple Valley

### Problem of the week

Oct 7, 2019

Lower Elementary:
Question: Apollo 17 was the most recent manned spacecraft to go to the moon. It took 110 hours to get there. How many full days did it take the astronauts to get to the moon?
Solution: There are 24 hours in a day, so we can solve this problem by counting up to 110 by 24. One day is 24 hours, two days is 48, three is 72, four is 96, and 5 is 120. 120 is too many, so we know that it took 4 full days to get to the moon. Since 110 hours is 14 more hours than 96 hours, it took 4 days and 14 hours.

Upper Elementary:
Question: The Earth’s orbit about the Sun is approximately 600 million miles. That’s how far it travels in a full year. How far does the Earth travel about the Sun in 3 months?
Solution: Since 3 months is a fourth of a full year, that means that the Earth travels a fourth of its orbital path. That’s 600 million miles ÷ 4 = 150 million miles.

Middle School:
Question: A space shuttle has 1 large fuel tank and 3 small fuel tanks. The tanks are filled with 600 tons of fuel in total. The large fuel tank is completely filled with 400 tons of fuel, and the rest of the fuel fills 21/2 small tanks. How much does each small tank hold when full?