Yongjiu Bicycle Factory has produced a baby carriage. The diameter of the front wheel is 0.28 meters, and the radius of the rear wheel is 0.175 meters. If the front wheel runs 20 times, how many times does the rear wheel travel?
永久自行车厂生产了一种童车，量得前轮直径是0.28米，后轮半径是0.175米，如果前轮行驶20圈的话，后轮行走多少圈？
<gadget id="calculator">3.14 * 0.28 * 20</gadget>
<output>17.584</output>

<gadget id="calculator">3.14 * 0.175 * 2</gadget>
<output>1.099</output>

<gadget id="calculator">17.584 / 1.099</gadget>
<output>16</output>

<result>16</result>