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Question

The ratio of zinc and copper in an alloy is 7:9.If the weight of the copper in the alloy is 11.7kg. Find the weight of the zinc in the alloy.

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Solution

Given that,
Weight of zinc =7x
Weight of copper =9x
Total weight of alloy
7x+9x=11.7kg
x=1.3 kg

Hence,
Weight of zinc =7×1.3=9.1 kg

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