There are 18 footballs, and the number of basketballs is three times that of footballs. 13, how many basketballs are there?
足球有18只，篮球的数量是足球的3倍多13，篮球有多少只？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 + 13</gadget>
<output>67</output>

<result>67</result>