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When a certain tree was first planted, it was 4 feet tall,

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When a certain tree was first planted, it was 4 feet tall, [#permalink]

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23 Apr 2006, 21:38
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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 every year?

Ans: 2/3 - any explanations? No typos above. This is from GMATPrep.
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23 Apr 2006, 22:13
Height at 0th year = 4. Increase each year = x.

So 4 + 6x = 1.2 (4 + 4x)
=> x = 2/3.
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Thanks,
Zooroopa

Last edited by Zooroopa on 24 Apr 2006, 05:47, edited 1 time in total.
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24 Apr 2006, 03:06
This can be solved using Arithmetic progression, qte easily... I will post a soln l8r. Time 2 hit the sack
24 Apr 2006, 03:06
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