Planting trees in spring, originally planned to plant one tree every 10 meters, but after determining the location, it was found that the trees were too close together, which was not conducive to the growth of the tree, so it was decided to plant one tree every 15 meters, so that in the length of 150 meters , how many already set points do not need to be changed?
春天植树，原计划每隔10米种一棵，确定好位置后发现树与树之间太密，不利于树的生长，决定改为每隔15米种一株，这样在150米的长度中，有多少个已经定好的点不需要再改动？
<gadget id="calculator">5 * 2 * 3</gadget>
<output>30</output>

<gadget id="calculator">150 / 30</gadget>
<output>5</output>

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

<result>6</result>