The children planted 5 trees, and there were 18 trees left; if each child planted 6 trees, there were 7 trees left. How many trees did the children plant in total?
小朋友栽树，每人栽5棵，还剩18棵；如果每人栽6棵，则还剩7棵．小朋友们共植树多少棵．
<gadget id="calculator">18 - 7</gadget>
<output>11</output>

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

<gadget id="calculator">11 / 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 5</gadget>
<output>55</output>

<gadget id="calculator">55 + 18</gadget>
<output>73</output>

<result>73</result>