The radius of the small circle is 3 cm, the radius of the large circle is 5 cm, and the circumference of the large circle is how many times the circumference of the small circle.
小圆半径是3厘米，大圆半径是5厘米，大圆周长是小圆周长的多少倍．
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>