There are a certain number of toys in a packing box. It takes 2 hours for A to process a box of toys independently, and 8 hours for B to process a box of toys independently. The two cooperate to process a box of toys. Among them, B processed 42 toys, how many toys are there in a box?
一个包装箱内放一定数量的玩具，甲独立加工一箱子玩具要用2小时，乙独立加工一箱玩具要用8小时，两人合作加工完一箱玩具．其中乙加工了42个，一箱玩具有多少个？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/2) + (1/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / (5/8)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(8/5) * (1/8)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">42 / (1/5)</gadget>
<output>210</output>

<result>210</result>