The luggage factory produced 2640 school bags in April, 1300 in the first half of May, and 1500 in the second half of May. How many more were produced in May than in April?
箱包厂四月份生产书包2640个，五月份上半月生产1300个，下半月生产1500个．五月份比四月份多生产多少个？
<gadget id="calculator">1_500 - 2_640</gadget>
<output>-1_140</output>

<gadget id="calculator">1_300 + (-1_140)</gadget>
<output>160</output>

<result>160</result>