When the young pioneers go to plant trees, if each person digs 5 tree holes, there are still 3 tree holes that no one has dug; if 2 of them dig 4 holes each, and the rest each dig 6 holes, all tree holes will be dug exactly. How many tree pits did the Young Pioneers dig?
少先队员去植树，如果每人挖5个树坑，还有3个树坑没人挖；如果其中2人各挖4个，其余每人各挖6个，就恰好挖完所有树坑．少先队员们共挖了多少个树坑．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">7 / 1</gadget>
<output>7</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">8 + 30</gadget>
<output>38</output>

<result>38</result>