After putting 10 grams of salt into a cup containing 40 grams of water and stirring evenly, what is the salt content of this cup of salt water?
在一个盛有40克水的杯子中放入10克盐均匀搅拌后，这杯盐水含盐多少．
<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

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