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1. A pharmacist wants to mix a 22% saline solution with a 46% saline solution to...

1. A pharmacist wants to mix a 22% saline solution with a 46% saline solution to get 16 L of a 31% saline solution. How much of each solution should be used?

2. A helicopter flies 256 miles against the wind in 2 hours. With the wind, it can fly 384 miles in the same amount of time. Find the speed of the helicopter in still air.

3. The half-life of silicon-32 is 710 years. If 100 grams is present now, how much will be present in 300 years? (Round your answer to three decimal places.)

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