A bag of milk powder weighs 400 grams, how many bags of such milk powder weigh 4 kg.
一袋奶粉重400克，多少袋这样的奶粉重4千克．
<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 / 400</gadget>
<output>10</output>

<result>10</result>