A strip of paper is 24 cm long. First, dots are drawn at intervals of 3 cm from the left, and then dots are drawn at intervals of 4 cm from the left. Both ends of the strip are not dotted. How many dots are there in total on the strip? ．
一张纸条长24厘米，先从左起每隔3厘米点一个点，再从左起每隔4厘米点一个点，纸条的两端都不点，最后纸条上一共有多少个点．
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

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

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<result>9</result>