In order to better adapt to life in junior high school and cultivate Xiao Ming's reading ability at the same time, Dad decided to make a reading plan for Xiao Ming during the summer vacation: requiring Xiao Ming to finish reading a book while adding a fixed amount of reading materials every day. Assuming all The reading content is counted by the number of pages. Xiaoming’s reading speed is the same and fixed (the unit is page/10 minutes). If he reads 50 minutes a day, he can just complete the original reading books and new reading materials in 24 days; if he reads 90 minutes a day Minutes, 12 days to complete the original reading books and new reading materials. Now Xiaoming reads for a few minutes every day, is very serious, and the effect is also very good. After 8 days, his father decided to halve the new reading materials every day in the future. As a result, Xiaoming just completed all the readings in 40 days. Q: How many minutes does Xiao Ming read every day?
为了更好的适应初中生活，同时培养小明的阅读能力，爸爸决定给小明这段暑假制定一个阅读计划：要求小明完成阅读一本书籍得同时，每天还要新增固定数量得阅读材料，假设所有阅读内容以页数计数，小明的阅读速度是相同得、固定的(单位是页/10分钟)，如果每天阅读50分钟，24天恰好完成原有阅读书籍及新增阅读材料；如果每天阅读90分钟，12天就恰好完成原有阅读书籍及新增阅读材料．现小明每天固定阅读若干分钟，表现得很认真，效果也很好，8天后，爸爸决定以后每天得新增阅读材料减半，结果小明40天恰好完成所有阅读．问：小明每天阅读几分钟？
<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">5 * 24</gadget>
<output>120</output>

<gadget id="calculator">90 / 10</gadget>
<output>9</output>

<gadget id="calculator">9 * 12</gadget>
<output>108</output>

<gadget id="calculator">120 - 108</gadget>
<output>12</output>

<gadget id="calculator">24 - 12</gadget>
<output>12</output>

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

<gadget id="calculator">12 * 1</gadget>
<output>12</output>

<gadget id="calculator">108 - 12</gadget>
<output>96</output>

<gadget id="calculator">40 - 8</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">96 + 8 + 16</gadget>
<output>120</output>

<gadget id="calculator">120 / 40</gadget>
<output>3</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<result>30</result>