batch of pears is shipped from the fruit shop, 35% of the pears are sold on the first day, and 40% are sold on the second day, how many pears are left in this batch.
水果店运来一批梨子，第一天售出35%，第二天售出40%，还剩下这批梨子的多少．
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (7/20) - (2/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>