A batch of leather shoes was shipped from the store, sold (1/3) of the total in the first half of the month, and (2/5) of the total in the second half of the month. There are still 64 pairs of shoes that have not been sold out. How many pairs of this batch of shoes are there in total?
商店里运来一批皮鞋，上半月卖出总数的(1/3)，下半月卖出总数的(2/5)，还剩下64双没有卖完，这批鞋一共有多少双？
<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">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">64 / (4/15)</gadget>
<output>240</output>

<result>240</result>