There are two hoops, the diameter of the big hoop is 80cm, and the diameter of the small hoop is 50cm. From place A to place B, the big hoop rolls 200 times, how many times does the small hoop need to roll?
有两个铁环，大铁环直径80CM，小铁环直径是50CM，从甲地到乙地，大铁环滚动200周，小铁环要滚动多少周？
<gadget id="calculator">3.14 * 80 * 200</gadget>
<output>50_240</output>

<gadget id="calculator">3.14 * 50</gadget>
<output>157</output>

<gadget id="calculator">50_240 / 157</gadget>
<output>320</output>

<result>320</result>