What is the result of subtracting 9 (1/20) from (17/20)?
从(17/20)里减去9个(1/20)，结果是多少？
<gadget id="calculator">17 / 20</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 9</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(17/20) - (9/20)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>