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5 votes
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User Yashhy
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Let N be the nickels and Q be the quarters, since Charlie found 35 coins, we can write


\begin{gathered} N+Q=35 \\ or\text{ equivalently} \\ N=35-Q \end{gathered}

Now, we know that a nickel is worth 5 cents and a quarter is worth 25 cents, then we can write


\begin{gathered} 5N+25Q=100*5.15 \\ 5N+25Q=515 \end{gathered}

Then, the answer is option a.

User Yasser Souri
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