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When a certain tree was planted , it was 4 feet tall and its

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Joined: 28 Jul 2004
Posts: 136

Kudos [?]: 73 [0], given: 2

Location: Melbourne
Schools: Yale SOM, Tuck, Ross, IESE, HEC, Johnson, Booth
When a certain tree was planted , it was 4 feet tall and its [#permalink]

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New post 02 Jan 2009, 21:40
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

When a certain tree was planted , it was 4 feet tall and its height increased by constant amount each year for next 6 yrs. At end of 6th year it was 1/5 taller than at the end of 4th year. By how many feet the height increased evey year.

1) 3/10
2) 2/5
3) 1/2
4) 2/3
5) 6/5

It looks damn so easy but I could not figure out the correct answer. Please help !!
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kris

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Posts: 2473

Kudos [?]: 832 [0], given: 19

Re: Height of tree [#permalink]

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New post 03 Jan 2009, 01:28
krishan wrote:
When a certain tree was planted , it was 4 feet tall and its height increased by constant amount each year for next 6 yrs. At end of 6th year it was 1/5 taller than at the end of 4th year. By how many feet the height increased evey year.

1) 3/10
2) 2/5
3) 1/2
4) 2/3
5) 6/5

It looks damn so easy but I could not figure out the correct answer. Please help !!



7-p537339?t=72570&hilit=taller#p537339
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Re: Height of tree [#permalink]

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New post 03 Jan 2009, 15:45
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krishan wrote:
When a certain tree was planted , it was 4 feet tall and its height increased by constant amount each year for next 6 yrs. At end of 6th year it was 1/5 taller than at the end of 4th year. By how many feet the height increased evey year.

1) 3/10
2) 2/5
3) 1/2
4) 2/3
5) 6/5

It looks damn so easy but I could not figure out the correct answer. Please help !!



If x is the amount of height increase every yr,

4+6x = (4+4x) + 1/5(4+4x)

Solve for x to get 2/3

Kudos [?]: 423 [1], given: 1

Re: Height of tree   [#permalink] 03 Jan 2009, 15:45
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When a certain tree was planted , it was 4 feet tall and its

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