Soldiers of a certain company plant trees. If each person digs 5 tree holes, there are still 3 tree holes that no one digs; All tree pits. How many tree pits did the soldiers have to dig in total?
某连战士植树，如果每人各挖5个树坑，还有3个树坑没人挖；如果其中2人各挖4个树坑，其余的人各挖6个树坑，就恰好挖完所有的树坑．问战士一共要挖多少个树坑？
<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">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">35 + 3</gadget>
<output>38</output>

<result>38</result>