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A certain type of mineral is consisted of 5% ore that are

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A certain type of mineral is consisted of 5% ore that are [#permalink] New post 06 May 2006, 04:25
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A certain type of mineral is consisted of 5% ore that are either gold or silver. Among them, silver is 10 times as much as gold. How much gold does 50 pounds of such mineral contain?
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 [#permalink] New post 06 May 2006, 04:32
the ratio of gold in ore is 1/11

50 pounds of such mineral contain 2.5 pounds of ore

so gold (1/11) * 2.5 = 2.5/11 =.227
  [#permalink] 06 May 2006, 04:32
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