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Fractions
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 1 If 89 out of 100 grasshoppers are immune to a pesticide after five years of use, how many would be expected to be immune in a population of 2.5 million after five years of use?
 2 If half of all type-Y organisms are bristly and eight-ninths of all type-Y organisms are wrinkly, what is the maximum number of type-Y organisms that are neither bristly nor wrinkly out of a sample population of 787?
 3 A recent forest fire near Littleville destroyed four-fifths of the trees in Bigtree National Forest. The forest covers 3150 km2. There is now about 50 tons of salvageable wood per km2 in the burned area. The part of the forest that was not destroyed by fire will not be open to the salvagers. Assuming the trees are evenly distributed throughout the park, about how long will it take to remove all the salvageable wood at a rate of 60 1/2 tons per day? Round your answer to the nearest whole number.
 4 Some sea turtles can swim ten 90 times faster than tortoises can walk. Based on this information, if a sea turtle can swim at a rate of 10 MPH, at what rate can some tortoises walk? Express your answer as a fraction.
 5 In a herd of 977 zebras, about half of one percent of all animals are injured crossing a stream. How many are injured?
 6 Ranger Roger has counted about 25% of the scrum trees in Vista Park today. He has this chore of counting the 1,200 scrum trees three times a year. If this is his second count this year, what fraction of the total number of scrum trees has he counted so far?