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Fractions
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1.   A recent forest fire near Littleville destroyed two-fifths of the trees in Bigtree National Forest. The forest covers 3120 km2. There is now about 40 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 1/3 tons per day? Round your answer to the nearest whole number.

2.   In an introductory biology lab, students are asked to determine the average length of the red earthworm. Working in teams, they reported the data in Table 1. At the end of the experiment, the teams combined their data to find the overall average. What was the overall average? Round your answer to the nearest tenth.
Table 1
Team #Average length (cm)# of worms measured
16 3/53
26 1/54
38 3/85


3.   If one-fifth of all type-Y organisms are bristly and six-sevenths 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 1,975?

4.   Some sea turtles can swim ten 80 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.   Ranger Roger has counted about 30% 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?

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