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A math question -how to solve

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A math question -how to solve [#permalink] New post 24 Oct 2006, 10:29
Please see the attached gif file. Please explain in detail how to solve the question
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q1.GIF
q1.GIF [ 10.1 KiB | Viewed 347 times ]

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 [#permalink] New post 24 Oct 2006, 10:33
Let amount of increase each year be x.
height at the end of 1st year 4+x
height at end if 2nd year is ..4+2x
height end of 4th year is ..4+4x
height at the end of 6th year is 4+6x

4+6x-4-4x=1/5(4+4x)
x=2/3
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 [#permalink] New post 24 Oct 2006, 10:37
thanks yogeshsheth
Unnecessarily I made it complicated by considering compound interest funda
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 [#permalink] New post 24 Oct 2006, 11:17
  [#permalink] 24 Oct 2006, 11:17
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A math question -how to solve

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