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Two pairs of shoes and four pairs of socks cost $109, and three pairs of shoes and five pairs of socks cost $160. Find the cost of a pair of socks.

Separate 10 into the sum of two numbers so that 1/5 of the difference between them is equal to 1/2.

1 grain = 60 mg. If a physician prescribes a medicine that contains 15 mg, how many grains are in the medication?

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