There are 160 grams of salt water with a salt content of (1/10), how many grams of salt should be added to turn these salt water into salt water with a salt content of (1/5)?
现有含盐量为(1/10)的盐水160克，把这些盐水变成含盐量为(1/5)的盐水，需加盐多少克？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(9/10) / (4/5)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">160 * (9/8)</gadget>
<output>180</output>

<gadget id="calculator">180 - 160</gadget>
<output>20</output>

<result>20</result>