Solve the problem. See Example.
Saturn, Jupiter, and Uranus have a total of 153 known satellites (moons). Jupiter has 2 more satellites than Saturn, and Uranus has 35 fewer satellites than Saturn. How many known satellites does Uranus have? (Source: http://solarsystem.nasa.gov)

EXAMPLE Dividing a Board into Pieces
A project calls for three pieces of wood. The longest piece must be twice the length of the middle-sized piece. The shortest piece must be 10 in. shorter than the middle-sized piece. If a board 70 in. long is to be used, how long must each piece be?

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