Problem

Bob has 30 coins, which are all dimes and quarters. If the total amount of money he has is \( \$ 4.80 \), how many of each coin does he have?

Answer

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Answer

Solve the system of equations.

Steps

Step 1 ：Let d be the number of dimes, and q be the number of quarters.

Step 2 ：Set up two equations: \(d + q = 30\) and \(0.10d + 0.25q = 4.80\).

Step 3 ：Solve the system of equations.

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