Xiaohong is going to be the host of team activities. Her mother has prepared 4 different tops and 5 different pants for her. How many different ways can she wear them?
小红要做队活动的主持人，妈妈给她准备了4件不同的上衣，5条不同的裤子，她一共可以有多少种不同的搭配穿法？
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>