Question

4.5 grams of an alloy of copper and zinc contains 3.5 of copper what weight of copper will be there in 18.9 grams of the alloy

Answer 1

weight of allow will be equal to weight of copper +zinc
4.5=cu+3.5
cu=1

Answer 2

ans is
$(1 \div 3.5) \times 18.9 =$
now solve it
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that is ans'louoll is,om l =5.6