A special bicycle has two round wheels, front and rear. The radius of the front wheel is 0.35 meters, and the diameter of the rear wheel is 0.28 meters. In normal driving, when its rear wheel turns 20 times, how many turns does the front wheel turn? (π takes 3.14)
一种特制的自行车有前后两个圆形车轮．前轮半径0.35米，后轮直径0.28米．正常行驶中，当它的后轮转动了20圈时，前轮转动了多少圈．(π取3.14)
<gadget id="calculator">3.14 * 0.28 * 20</gadget>
<output>17.584</output>

<gadget id="calculator">3.14 * 0.35 * 2</gadget>
<output>2.198</output>

<gadget id="calculator">17.584 / 2.198</gadget>
<output>8</output>

<result>8</result>