Parents and Xiaohong go to the park to play, each ticket is 18 yuan, and father paid 100 yuan, how much should I get back?
爸爸妈妈和小红到公园游玩，每张门票18元钱，爸爸付了100元，应找回多少元？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">100 - 54</gadget>
<output>46</output>

<result>46</result>