Dissolve 250 grams of salt in 1000 grams of water, what is the mass of salt in the salt water?
把250克盐溶于1000克水中，盐占盐水质量的多少．
<gadget id="calculator">250 + 1_000</gadget>
<output>1_250</output>

<gadget id="calculator">250 / 1_250</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>