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

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Director
Joined: 08 Feb 2007
Posts: 609

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Location: New Haven, CT
When a certain tree was first planted, it was 4 ft. tall, [#permalink]

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29 Jul 2007, 09:35
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When a certain tree was first planted, it was 4 ft. 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 is was at the end of the 4th year. By how man feet did the height of the tree increase each year?

a) 3/10
b) 2/5
c) 1/2
d) 2/3
e) 6/5

This was question 31 and it really threw my timing off. Quick approach please. I set up an equation but got stuck.

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Senior Manager
Joined: 28 Feb 2007
Posts: 300

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29 Jul 2007, 10:02
Each year increasd by X

after 6 years : 4+6x
after 4 years : 4+4x

4+6x=(4+4x)(1+1/5) sokve for x. x=2/3. D.

Kudos [?]: 44 [0], given: 0

29 Jul 2007, 10:02
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