A box of pencils, 2 less for 5 people on average, and 4 more for 6 people on average, how many pencils are there at least in this box?
一盒铅笔，平均分给5人少2支，平均分给6人多4支，这盒铅笔至少有多少支？
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 - 2</gadget>
<output>28</output>

<result>28</result>