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

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tim
 Post subject: Re: When a certain tree was first planted, it was 4 feet tall
 Post Posted: Sun Jan 15, 2012 4:13 pm 
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ManhattanGMAT Staff


Posts: 2242
Location: Southwest Airlines, seat 21C
thanks for sharing!

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Tim Sanders
Manhattan GMAT Instructor
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AmunaGmat
 Post subject: Re:
 Post Posted: Sat Mar 10, 2012 11:23 pm 
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Course Students


Posts: 28
StaceyKoprince wrote:
This is essentially a sequence problem in disguise. Let x = amount of yearly growth, in feet.

Yr0 = 4
Yr1 = 4+x
Yr2 = 4+x+x=4+2x
Yr3 = 4+x+x+x=4+3x
Yr4 = 4+x+x+x+x=4+4x
Yr5 = 4+x+x+x+x+x=4+5x
Yr6 = 4+x+x+x+x+x+x=4+6x

We are told the amount at the end of Year 6 is 6/5 of the amount at the end of year 4. Thus we can write:

4+6x = 6/5 (4+4x)
5(4+6x) = 6(4+4x)
20+30x = 24+24x
6x=4
x=2/3



I never understood any formula in these stuff, Stacey you nailed it. Thanks!!!
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jnelson0612
 Post subject: Re: Re:
 Post Posted: Sat Mar 17, 2012 11:26 pm 
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ManhattanGMAT Staff


Posts: 1857
AmunaGmat wrote:
I never understood any formula in these stuff, Stacey you nailed it. Thanks!!!


Great, thanks! Good to hear!

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Jamie Nelson
ManhattanGMAT Instructor
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