It is measured that a section of steel wire is 0.5 meters long and weighs 0.4 kilograms. There is another 100 meters of steel wire like this, and how many kilograms it weighs.
测得一段钢丝长0.5米，重0.4千克，另有这样的钢丝100米，重多少千克．
<gadget id="calculator">0.4 / 0.5</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 * 100</gadget>
<output>80</output>

<result>80</result>