On one side of the path, start to plant trees from the end point. If you plant one tree every 4 meters, you need 37 trees. If you plant one tree every 6 meters, how many trees will not move?
小路的一边从端点开始种树，每隔4米种一棵需37棵，如果每隔6米种一棵，可有多少棵树不动？
<gadget id="calculator">37 - 1</gadget>
<output>36</output>

<gadget id="calculator">36 * 4</gadget>
<output>144</output>

<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>