and B share 4 hours to process a batch of parts. A adds 85 parts per hour, and B processes 60 parts per hour. How many more parts does A process than B? (solution in two ways)
甲、乙二人共用4小时加工一批零件，甲每小时加85个，乙每小时加工60个，甲比乙多加工多少个？(用两种方法解)
<gadget id="calculator">85 * 4</gadget>
<output>340</output>

<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">340 - 240</gadget>
<output>100</output>

<result>100</result>