1 kg of salt water contains 40 grams of salt, which is the amount of salt water.
1千克的盐水含盐40克，盐是盐水的多少．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">40 / 1_000</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>