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In one alloy there is 12% chromium while in another alloy...

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In one alloy there is 12% chromium while in another alloy... [#permalink] New post 21 Feb 2013, 06:54
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86% (02:32) correct 14% (01:27) wrong based on 36 sessions
In one alloy there is 12% chromium while in another alloy it is 8%. 15 kg of the first alloy was melted together with 35 kg of the second one to form a third alloy. Find the percentage of chromium in the new alloy.

A. 8.8%
B. 9%
C. 9.2%
D. 8.6%
E. 8.4%
[Reveal] Spoiler: OA
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Re: In one alloy there is 12% chromium while in another alloy... [#permalink] New post 21 Feb 2013, 06:58
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(15x.12 + 35x.08)/(15+35) x100=9.2
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Re: In one alloy there is 12% chromium while in another alloy... [#permalink] New post 21 Feb 2013, 07:01
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antoxavier wrote:
In one alloy there is 12% chromium while in another alloy it is 8%. 15 kg of the first alloy was melted together with 35 kg of the second one to form a third alloy. Find the percentage of chromium in the new alloy.

A. 8.8%
B. 9%
C. 9.2%
D. 8.6%
E. 8.4%


The amount of chromium in the new 15+35=50 kg alloy is 0.12*15+0.08*35=4.6 kg, so the percentage is 4.6/50*100=9.2%.

Answer: C.
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Re: In one alloy there is 12% chromium while in another alloy...   [#permalink] 21 Feb 2013, 07:01
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In one alloy there is 12% chromium while in another alloy...

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