Three ropes each 4 cm in length are used to wind a leaf exactly twice. What is the circumference of the leaf in cm?
用三根长都是4厘米的绳子刚好绕一片树叶两圈，这一片树叶的周长是多少厘米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>