There are 234 red skipping ropes in the sports room, and 76 fewer blue skipping ropes than the red ones. Every 28 skipping ropes are placed in a box, so how many boxes are needed for these skipping ropes?
体育室有红色跳绳234根，蓝色跳绳比红色跳绳少76根，每28根跳绳放在一个盒子里，那么这些跳绳一共需要多少个盒子？
<gadget id="calculator">234 - 76</gadget>
<output>158</output>

<gadget id="calculator">158 + 234</gadget>
<output>392</output>

<gadget id="calculator">392 / 28</gadget>
<output>14</output>

<result>14</result>