A processes 48 parts per hour, and B processes 36 parts per hour. After working together for 8 hours, 64 waste products are detected. How many qualified parts do the two process on average per hour?
甲每小时加工48个零件，乙每小时加工36个零件，两人共同工作8小时后，检验出64个废品．两人平均每小时共加工多少个合格的零件？
<gadget id="calculator">48 + 36</gadget>
<output>84</output>

<gadget id="calculator">84 * 8</gadget>
<output>672</output>

<gadget id="calculator">672 - 64</gadget>
<output>608</output>

<gadget id="calculator">608 / 8</gadget>
<output>76</output>

<result>76</result>