A cup of salt water contains 10 grams of salt and 90 grams of water. What is the salt content of this cup of salt water?
一杯盐水，盐10克，水90克，这杯盐水的含盐率．
<gadget id="calculator">10 + 90</gadget>
<output>100</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) * 1</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>