A cow weighs 200 kg. An elephant weighs 4 tons, how much does an elephant weigh more than a cow in kilograms?
一头牛的体重是200千克．一只大象的体重是4吨，那么一只大象的体重比一头牛的体重重多少千克？
<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 - 200</gadget>
<output>3_800</output>

<result>3_800</result>