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There are two bars of gold-silver alloy; The first is 40%

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There are two bars of gold-silver alloy; The first is 40% [#permalink] New post 12 Mar 2008, 10:20
There are two bars of gold-silver alloy; The first is 40% gold and 60% silver,
the second is 30% gold and 79% silver. If both bars are melted into an 8 kg.
bar that is 5 parts gold and 11 parts silver, what was the weight in kilograms of
the first bar?

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Re: gprep mixtures [#permalink] New post 12 Mar 2008, 19:00
A - 1kg

if m is the weight of 1st bar and n is the weight of 2nd bar..

For gold - 0.4m+0.3n=(5/16)*8
Given that m+n=8

Solving above, m=1, n=7
Re: gprep mixtures   [#permalink] 12 Mar 2008, 19:00
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There are two bars of gold-silver alloy; The first is 40%

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