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  How much of each a 10% gold alloy and a 24% gold alloy should be...

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Basic Math

 

  1. How much of each a 10% gold alloy and a 24% gold alloy should be mixed together to make 40 grams of a 22% gold alloy?
  1. A cold water faucet can fill the bath tub in 12 minutes, and a hot water faucet can fill the bath tub in 18 minutes. The drain can empty the bath tub in 24 minutes. If both faucets are on and the drain is open, how long would it take to fill the bath tub?
  1. A 555-mile, 5-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 105 mph. Then the tailwind picked up, and the remainder of the trip was flown at an average speed of 115 mph. For how long did the plane fly at each speed?

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