Answer:
12 is the denominator.
Explanation:
Here's a trick:
If your ever making a proportion or equivalent fractions, always see what number the numerator/denominator is multiplied by to make the equivalent fraction.
In our case we have 3 being multiplied by x to get 18.
Since this is just 18 divided by 3, we ge that x = 6.
Now we can figure out our denominator's value.
We will multiply 2 times x to get our answer.
Since x = 6, we have 2 * 6 = 12 is our answer.
Check:
When we simplify, our answer should be equivalent to 3/2. If it isn't we've made a mistake. 18/12 = 6/4 = 3/2 so we are correct.