An alloy contains copper and zinc in the ratio 7 : 3. If it contains 12.6 g of copper, how much does this alloy weigh?
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Given:
Ratio (Copper : Zinc) = 7 : 3
Copper = 12.6 g
Since 7 parts represent copper, 7 parts = 12.6 g
1 part = 12.6 ÷ 7 = 1.8 g
Zinc = 3 x 1.8 g = 5.4 g
Total weight = Copper + Zinc
Substituting the values in above:
Total weight = 12.6 g + 5.4 g = 18 g
The weight of the alloy is 18 g.
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