Question 12
Ratio, Percentages and RatesA casting is made up of Copper and Zinc. If 65% of the casting is Zinc and there are 147g of Copper, what is the mass of the casting?
- A.320 g
- B.420 g
- C.520 g
- D.620 g
Show the answer and explanation
Answer: B (420 g)
Explanation
Copper is 35% of the casting: 147 ÷ 0.35 = 420 g.