A strip of paper is 48 cm long. Dots are drawn at intervals of 3 cm from the left, and then dots at intervals of 4 cm from the left. Both ends of the strip are not dotted. How many dots are there on the strip?
一张纸条长48厘米，从左起先每隔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">48 / 3</gadget>
<output>16</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">11 - 3</gadget>
<output>8</output>

<gadget id="calculator">15 + 8</gadget>
<output>23</output>

<result>23</result>