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]

21 Feb 2013, 07:54

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84% (02:34) correct

15% (00:56) wrong

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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%

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Re: In one alloy there is 12% chromium while in another alloy... [#permalink]

21 Feb 2013, 07:58

(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]

21 Feb 2013, 08:01

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antoxavier wrote:

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, 08:01

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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...

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