A United States presidential coin is made from an alloy of four metals—copper, zinc, manganese, and nickel—with weights in the ratio of , respectively. The coin weighs a total of 8 grams. What is the weight of the zinc in this coin?
- A0.28 g
- B0.48 g
- C0.96 g
- D48 g
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Correct answer: B
Add the four values in the ratio
(177 + 12 + 7 + 4 = 200)
and use the sum as the denominator. Use that to find the fraction of zinc in one of the coins. Then reduce the fraction:
Multiply this fraction by 8 to find the number of grams of zinc in decimal form:
8 x 0.06 = 0.48