Guangming Light Bulb Factory tested and produced a new type of energy-saving lamp. The first batch produced 640 pieces, and 10 of them were unqualified after inspection. How many boxes are needed to pack qualified energy-saving lamps in a box of 6?
光明灯泡厂试验生产一种新型节能灯．第一批生产了640个，经检验，其中有10个不合格．将合格的节能灯每6个装一盒，需要多少个包装盒？
<gadget id="calculator">640 - 10</gadget>
<output>630</output>

<gadget id="calculator">630 / 6</gadget>
<output>105</output>

<result>105</result>