A 4 meter long wire weighs about 200 grams. The same wire weighs 4000 grams, how many meters it may be.
4米长的铁丝约重200克．同样的铁丝重4000克，它可能约是多少米长．
<gadget id="calculator">4_000 / 200</gadget>
<output>20</output>

<gadget id="calculator">4 * 20</gadget>
<output>80</output>

<result>80</result>