There is a certificate with a length of 30 cm and a width of 20 cm. If we make a wooden frame for it, how many meters should it be?
有一张奖状，长30厘米、宽20厘米，给它做一个木框，大约需要多少米长？
<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">50 * (1/50)</gadget>
<output>1</output>

<result>1</result>