Workers A and B process 900 parts together and work for 6 hours to complete the task. B processes 75 pieces per hour, how many pieces does A process per hour?
甲、乙两工人一同加工900个零件，工作6小时完成任务．乙每小时加工75个，甲每小时加工多少个？
<gadget id="calculator">900 / 6</gadget>
<output>150</output>

<gadget id="calculator">150 - 75</gadget>
<output>75</output>

<result>75</result>