In the bar chart, 500 kg is represented by a straight bar of 0.5 cm long, so how many centimeters should be drawn for the straight bar representing 3000 kg.
在条形统计图里，用0.5厘米长的直条表示500千克，那么表示3000千克的直条应该画多少厘米．
<gadget id="calculator">3_000 / 500</gadget>
<output>6</output>

<gadget id="calculator">6 * 0.5</gadget>
<output>3</output>

<result>3</result>