The school sends some students to move saplings. If each person moves 6 saplings, the difference is 4; if each person moves 8, the difference is 18. How many saplings are there in this batch?
学校派一些学生去搬树苗，如果每人搬6棵，则差4棵，如果每人搬8棵，则差18棵，这批树苗有多少棵．
<gadget id="calculator">18 - 4</gadget>
<output>14</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">42 - 4</gadget>
<output>38</output>

<result>38</result>