Some fishermen established the following system of measurements for the length of fish. Answer questions 1 and 2 using the following units: 1 finger = 5 nails 1 hand = 3 fingers 1 elbow = 2 hands 1 arm = 2 elbows

1. How many nails long is a fish that is 4 arms and 3 fingers long?

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2. Use arms, elbows, hands, fingers, and nails to express the length in the fewest units possible for a fish that is 5000 nails long.

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3. If the lengths of all the sides of the trapezoid in the figure at right are tripled, what is the area of the resulting trapezoid? (Note that the dots are spaced 1 inch apart vertically and horizontally.)

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4. A prism with a base 30 cm x 20 cm has a height of 50 cm. This prism is completely filled with water, and the water level starts to fall at a steady rate of 1 cm every second. What is the volume of water in the prism after 4 seconds?

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5. There are 1 billion people in China. If they lined up four in a row and marched past you at the rate of 25 rows per minute, how long would it take the parade to pass you? Give your answer in days, hours, and minutes.

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