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A certain shade of gray paint is obtained by mixing 3 parts

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A certain shade of gray paint is obtained by mixing 3 parts [#permalink] New post 24 Jul 2003, 17:35
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. A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of black paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half- gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture?

what's the fastest way to collect $200 :-D
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 [#permalink] New post 24 Jul 2003, 17:58
2.5 gallons?

6/8 for the white paint- 1 gallon
10/8 for the black- 1.5 gallons

so 2.5 gallon would be the least.

2nd question is a good one!!
  [#permalink] 24 Jul 2003, 17:58
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A certain shade of gray paint is obtained by mixing 3 parts

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