108 adult tickets sold.
Explanation:
To do this equation, we can set x equal to the number of adult tickets sold, and then set up the following equation:
x+3x=432
Since there are three times as many student tickets as adult tickets and the total is 432, you can just use all this information together to make an equation. From there, you can combine like terms to create this equation:
4x=432
After this, just divide both sides by 4 to reach the answer of:
x=108
