3. Brass is an alloy of copper and zinc in the ratio 13: 7. How much o
metal is needed to make 2 kg of brass?
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Answer:
2 kg =2×1000gm=2000gm
copper needed= 13×2000/(13+7) gm
=13×2000/20gm
=13×100gm=1300gm
zinc needed=7×2000/(13+7) gram
=7×2000/20gm
=7×100gm=700gm
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