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PS: Trees

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PS: Trees [#permalink] New post 02 Oct 2006, 05:53
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Please explain:

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 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?

A. 3/10
B. 2/5
C. 1/2
D. 2/3
E/ 6/5
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Re: PS: Trees [#permalink] New post 02 Oct 2006, 06:20
govinam wrote:
Please explain:

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 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?

A. 3/10
B. 2/5
C. 1/2
D. 2/3
E/ 6/5



Took x as constant increase. Afer 6 years, height is 4+6x

After 4 years, height is 4+4x

(4+4x)6/5 = 4+6x

x= 2/3

D is my answer.
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the way is difficult, but perfect trust makes it easy.

Re: PS: Trees   [#permalink] 02 Oct 2006, 06:20
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