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

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Manager
Joined: 05 Aug 2008
Posts: 88
Schools: McCombs Class of 2012
When a certain tree was first planted, it was 4 feet tall  [#permalink]

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29 Dec 2008, 00:23
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 $$\frac{1}{5}$$ taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?

(A) $$\frac{3}{10}$$
(B) $$\frac{2}{5}$$
(C) $$\frac{1}{2}$$
(D) $$\frac{2}{3}$$
(E) $$\frac{6}{5}$$

Attachment:

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VP
Joined: 17 Jun 2008
Posts: 1474

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29 Dec 2008, 00:46
4 + 6x = (1 + 1/5)(4 + 4x)
or, x = 2/3
Manager
Joined: 05 Aug 2008
Posts: 88
Schools: McCombs Class of 2012

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29 Dec 2008, 00:54
I got the the same equation except for the 1 in (1 + 1/5), can you explain why it is there?

thanks
Manager
Joined: 27 May 2008
Posts: 192

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29 Dec 2008, 02:13
The question clearly says 1/5 taller than.. which means the tree is 1/5 more tall than it was at the end of 4th year
aka 20% more.

So 4 + 6x = 1.2(4 + 4x)
Manager
Joined: 05 Aug 2008
Posts: 88
Schools: McCombs Class of 2012

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29 Dec 2008, 10:28
ah silly of me. thank you for the explanation.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: Tree Growth &nbs [#permalink] 29 Dec 2008, 10:28
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# When a certain tree was first planted, it was 4 feet tall

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