There is a batch of fruits, buy all (4/15) on the first day, buy all (1/4) on the second day, and sell less than the sum of the previous two days on the third day (1/3). How much did you sell on the third day?
有一批水果，第一天买里全部的(4/15)，第二天买了全部的(1/4)，第三天卖的比前两天的总和少总数的(1/3)．第三天卖了多少．
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/4) - (1/3)</gadget>
<output>-1/12 = around -0.083333</output>

<gadget id="calculator">(4/15) + (-1/12)</gadget>
<output>11/60 = around 0.183333</output>

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