factory completed the quarterly plan (1/3) in April, completed the quarterly plan (2/5) in May, completed the quarterly plan (5/12) in June, and the actual production in three months exceeded the quarterly planned output by a few points How much?
某工厂四月份完成季度计划的(1/3)，五月份完成季度计划的(2/5)，六月份完成季度计划的(5/12)，三个月实际生产超过季度计划产量的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(5/12) - 1</gadget>
<output>-7/12 = around -0.583333</output>

<gadget id="calculator">(1/3) + (2/5) + (-7/12)</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>