Xiao Ming bought 5 cakes for 80 yuan, and the salesperson gave him 15 yuan back. How much is each cake on average?
小明拿80元去买5个蛋糕，售货员给回他15元，平均每个蛋糕多少元？
<gadget id="calculator">80 - 15</gadget>
<output>65</output>

<gadget id="calculator">65 / 5</gadget>
<output>13</output>

<result>13</result>