This week, 18 people attended an art workshop, but only 13 attended last week. Choose the three ways to express the ratio to compare the number of attendees this week to last week.

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To express the ratio comparing the number of attendees this week to last week, we can use the following three ways:

1. **Using the number of attendees this week as the numerator and the number of attendees last week as the denominator:**
   $$
   \frac{18}{13}
   $$
   This ratio indicates that there were 18 attendees this week for every 13 attendees last week.

2. **Using the number of attendees last week as the numerator and the number of attendees this week as the denominator:**
   $$
   \frac{13}{18}
   $$
   This ratio indicates that there were 13 attendees last week for every 18 attendees this week.

3. **Expressing the ratio in a more explicit form:**
   $$
   18:13
   $$
   This notation is a common way to represent ratios and clearly shows that there were 18 attendees this week compared to 13 attendees last week.

Each of these methods effectively communicates the comparison between the number of attendees in the two weeks.
1. $$ \frac{18}{13} $$ 2. $$ \frac{13}{18} $$ 3. 18:13

This week, 18 people attended an art workshop, but only 13 attended last week. Choose the three ways to express the ratio to compare the number of attendees this week to last week.

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