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# when a certain tree was first planted, it was 4 feet tall,

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Intern
Joined: 17 Jul 2006
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when a certain tree was first planted, it was 4 feet tall, [#permalink]

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17 Oct 2006, 20:31
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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?

3/10
2/5
1/2
2/3
6/5

Can someone please explain how to solve this one?

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Intern
Joined: 04 Sep 2006
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18 Oct 2006, 07:00
2/3

Ht at end of 6 years: 4+6x
Ht at end of 4 years: 4+4x

Diff: 2x

Stem of question says: 2x/(4+4x) = 1/5

x=2/3

every year Plant grows 2/3 ft.

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18 Oct 2006, 07:00
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# when a certain tree was first planted, it was 4 feet tall,

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