Dad bought 3 watermelons for 15 yuan, how much is each watermelon on average? Adapt this problem into an application problem of finding the total price.
爸爸买了3个西瓜用了15元，平均每个西瓜多少元？把此题改编为求总价的应用题．
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>