There are some students in the reading room. After 10 girls leave, the number of boys is 1.5 times that of girls. After 10 girls leave, the number of boys is 4 times that of girls. How many students were there in the reading room?
阅览室里有一些学生，走了10个女生后，男生人数是女生的1.5倍，又走了10个女生后，男生人数是女生的4倍．阅览室里原来有多少名学生？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">10 * 1.5</gadget>
<output>15</output>

<gadget id="calculator">40 - 15</gadget>
<output>25</output>

<gadget id="calculator">40 + 25</gadget>
<output>65</output>

<gadget id="calculator">4 - 1.5</gadget>
<output>2.5</output>

<gadget id="calculator">65 / 2.5</gadget>
<output>26</output>

<gadget id="calculator">26 - 10</gadget>
<output>16</output>

<gadget id="calculator">16 * 1.5</gadget>
<output>24</output>

<gadget id="calculator">26 + 24</gadget>
<output>50</output>

<result>50</result>