The machine tool factory completed (1/6), (1/5), (4/15), (7/10) of the annual tasks in the four quarters of last year, and what percentage of the annual plan was overfulfilled last year?
机床厂去年四个季度分别完成全年任务的(1/6)、(1/5)、(4/15)、(7/10)，去年超额完成全年计划的几分之几？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

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

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) - 1</gadget>
<output>-3/10 = around -0.3</output>

<gadget id="calculator">(1/6) + (1/5) + (4/15) + (-3/10)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>