The circumference of a circle is 25.12 cm. If the circumference is extended to 37.68 cm, the radius should be how many times the original radius.
一个圆的周长是25.12厘米，如果将周长延长至37.68厘米，则半径应是原来半径的多少倍．
<gadget id="calculator">37.68 / 3.14 / 2</gadget>
<output>6</output>

<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>