The department store shipped 420 pairs of sneakers, which were packed in 3 wooden boxes and 8 cardboard boxes. If 2 cardboard boxes contained as many sneakers as one wooden box, how many pairs of sneakers were packed in each wooden box?
百货商店运来420双球鞋，分别装在3个木箱和8个纸箱里，如果2个纸箱和一个木箱装的球鞋一样多，那么每个木箱装多少双球鞋？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">420 / 7</gadget>
<output>60</output>

<result>60</result>