There used to be 47 gray rabbits on the grass, and 13 less white rabbits than the gray rabbits. How many rabbits are there in total?
草地上原来有灰兔47只，白兔比灰兔少13只，草地上一共有多少只兔子？
<gadget id="calculator">47 - 13</gadget>
<output>34</output>

<gadget id="calculator">34 + 47</gadget>
<output>81</output>

<result>81</result>