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When a certain tree was first planted, it was 4 feet tall, [#permalink]
26 Apr 2008, 07:33
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When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year ?
At the end of 1st year --> 14/3 feet tall At the end of 2nd year --> 16/3 feet tall At the end of 3rd year --> 18/3 feet tall At the end of 4th year --> 20/3 feet tall At the end of 5th year --> 22/3 feet tall At the end of 6th year --> 24/3 feet tall
Difference in height between 6th year and 4th year = 24/3-20/3 = 4/3 Compared to 4th year, the tree in 6th year is (4/3) / (20/3) = 4/20 = 1/5 taller.
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