14. If a copier contains $75 \%$ letter-size paper and $25 \%$ legal-size paper, what is the ratio of letter-size paper to legal-size paper? A. $1: 2$ B. $1: 3$ C. $2: 1$ D. $3: 1$

Step 1 ：The question is asking for the ratio of letter-size paper to legal-size paper. Given that the copier contains 75% letter-size paper and 25% legal-size paper, we can express this as a ratio by dividing the percentage of letter-size paper by the percentage of legal-size paper.

Step 2 ：Let's denote the percentage of letter-size paper as \(letter\_size\_percentage = 75\) and the percentage of legal-size paper as \(legal\_size\_percentage = 25\).

Step 3 ：We can calculate the ratio as \(ratio = \frac{letter\_size\_percentage}{legal\_size\_percentage} = 3.0\).

Step 4 ：The ratio of letter-size paper to legal-size paper is 3:1. This means that for every 3 sheets of letter-size paper, there is 1 sheet of legal-size paper.

Step 5 ：Final Answer: \(\boxed{D. 3:1}\)