A pair of badminton rackets cost 60 yuan, and Mr. Li took 200 yuan to buy a few of the same badminton rackets, leaving 20 yuan. How many badminton rackets did Mr. Li buy?
一副羽毛球拍60元，李老师带了200元钱去买了几幅同样的羽毛球拍，还剩下20元．李老师买了几副羽毛球拍？
<gadget id="calculator">200 - 20</gadget>
<output>180</output>

<gadget id="calculator">180 / 60</gadget>
<output>3</output>

<result>3</result>