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When a certain tree was planted, it was 4 feet tall. The [#permalink]
27 May 2006, 09:05
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When a certain tree was planted, it was 4 feet tall. The height increased by the same amount each year for 6 years. At the end of the 6th year, the tree was 1/5 taller than the end of the 4th year. How many feet did the tree increase each year?