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example 4 out of 7

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example 4 out of 7 [#permalink] New post 26 Dec 2012, 07:58
http://www.mba.com/the-gmat/nex-gen/sam ... ?next=yes#

I am not sure why the answer for b is no.Please help!
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Re: example 4 out of 7 [#permalink] New post 28 Dec 2012, 20:48
The answer for b? The answers are yes, yes and then no...
Budget - $7,000
$7,000 = equal to the cost of 4 TL tests plus 15 radiocarbon tests, or $7,000 equal to the cost of 40 ICP-MS tests

a) 2 fired-clay statues and 10 bronze (metallic ore) statues
- Fired-clay objects: Thermoluminescence (TL) dating is used to provide an estimate of the time since clay was fired to create the object.
- Metallic ores or alloys: Inductively coupled plasma mass spectrometry (ICP-MS) is used to determine the ratios of traces of metallic isotopes present, which differ according to where the sample was obtained.

$7,000 > 2 TL tests + 10 ICP-MS

b) 3 fired-clay statues and 5 tin (metallic ore) implements
- Fired-clay objects: Thermoluminescence (TL) dating is used to provide an estimate of the time since clay was fired to create the object.
- Metallic ores or alloys: Inductively coupled plasma mass spectrometry (ICP-MS) is used to determine the ratios of traces of metallic isotopes present, which differ according to where the sample was obtained.

$7,000 > 3 TL tests + 10 ICP-MS

c) 4 fired-clay pots and 20 wooden (plant matter) statues
- Fired-clay objects: Thermoluminescence (TL) dating is used to provide an estimate of the time since clay was fired to create the object.
- Plant matter: While they are living, plants absorb carbon-14, which decays at a predictable rate after death; thus radiocarbon dating is used to estimate a plant’s date of death.

$7,000 < 4 TL tests + 20 radiocarbon tests
Re: example 4 out of 7   [#permalink] 28 Dec 2012, 20:48
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