The rest of the five-cent coin after 25% nickel is composed of which metal?

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Multiple Choice

The rest of the five-cent coin after 25% nickel is composed of which metal?

Explanation:
The five-cent coin is made from cupronickel, an alloy that is 75% copper and 25% nickel. If 25% of the coin is nickel, the remaining 75% must be copper. So the rest of the coin’s composition is copper. Silver, tin, and aluminum aren’t part of this cupronickel alloy, which is why they don’t fit.

The five-cent coin is made from cupronickel, an alloy that is 75% copper and 25% nickel. If 25% of the coin is nickel, the remaining 75% must be copper. So the rest of the coin’s composition is copper. Silver, tin, and aluminum aren’t part of this cupronickel alloy, which is why they don’t fit.

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