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Fractions
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 1 Mr. Bloop is giving a demonstration using a water trough. This is a device used to observe (among other things) the action of water on sediments. He began with a flow rate of one and a half gallons per minute (gpm) and every thirty seconds he halved the rate. Throughout the demonstration the students watched small marked stones move down the trough. What was the flow rate (in gpm) after he halved the rate six times? Express your answer as a fraction.
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 3 In examining a series of sediment layers in a canyon near the new BigTown geodesic dome, Dylan has been studying many layers of shale. He recently mapped all 30 of them. If a third of the layers are more than 300 million years old, how many layers are younger than 300 million years?
 4 In a creek bed, 1/6 of the gravel is less than 5 mm in diameter and 1/6 of it is between 5 and 10 mm in diameter. What fraction of the gravel is greater than one centimeter in diameter?
 5 Feldspar is a common mineral on earth. By some estimates, feldspar makes up three-fifths of the mineral mass in the crust. Convert this fraction to a percent.
 6 At the geologists convention 1/3 of the people are students, 1/6 are professors and 1/12 are industry representatives. The rest are employees of the convention center. If there are 360 people at the convention, how many are employees of the center?