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OpenStudy (anonymous):
The ratio of copper and iron in an alloy is 4:5 .If there is 25% impurity in copper then find the amount of impurity in 18 kg of the alloy.
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OpenStudy (shane_b):
There are 4+5=9 parts that make up the alloy. The copper portion is 0.75*4=3 parts and the iron is 5 parts. Therefore, 1 part in 9 consists of impurities. \[\frac{1}{9} * 18 = 2kg\]
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