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Q4: A sealed box was found which stated to have contained an alloy composed of equal parts by weight of two metals A and

Q4: A sealed box was found which stated to have contained an alloy composed of equal parts by weight of two metals A and B. These metals are radioactive, with half lives of 12 years and 18 years, respectively and when the container was opened it was found to contain 0.53 kg of A and 2.20 kg of B. Deduce the age of the alloy. (12M)

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