Typed a manuscript, typed all in the morning (5/12), and typed all in the afternoon (4/15), how many are left?
打一份稿子，上午打了全部的(5/12)，下午打了全部的(4/15)，还剩多少没有打？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(5/12) + (4/15)</gadget>
<output>41/60 = around 0.683333</output>

<gadget id="calculator">1 - (41/60)</gadget>
<output>19/60 = around 0.316667</output>

<result>19/60 = around 0.316667</result>