The radius of the front wheel of a baby carriage is 1.4 decimeters, and the diameter of the rear wheel is 3 decimeters and 5 cm. If the front wheel travels 20 laps, how many laps does the rear wheel travel?
一种童车前轮半径是1.4分米，后轮直径3分米5厘米，前轮行走20圈的路程，后轮行走多少圈．
<gadget id="calculator">3.14 * 1.4 * 2 * 20</gadget>
<output>175.84</output>

<gadget id="calculator">3.14 * 3.5</gadget>
<output>10.99</output>

<gadget id="calculator">175.84 / 10.99</gadget>
<output>16</output>

<result>16</result>