Subtract the difference between (2/5) and (1/12) from (1/2). What is the difference?
从(1/2)里减去(2/5)与(1/12)的差，差是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(2/5) - (1/12)</gadget>
<output>19/60 = around 0.316667</output>

<gadget id="calculator">(1/2) - (19/60)</gadget>
<output>11/60 = around 0.183333</output>

<result>11/60 = around 0.183333</result>