There are 13 giant pandas, 31 tigers, and 16 peacocks in the zoo. How many more tigers than peacocks?
动物园有13只大熊猫，有31只老虎，16只孔雀，老虎比孔雀多多少只？
<gadget id="calculator">31 - 16</gadget>
<output>15</output>

<result>15</result>