Naughty read a book in three weeks, read 25% of the book in the first week, read 25% of the book in the second week, and read 50 pages more in the third week than in the second week. How many pages did Naughty read in the first week?
淘气三星期看完一本书，第一星期看了这本书的25%，第二星期看了这本书的25%，第三星期比第二星期多看了50页．淘气第一星期看了多少页？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / (1/4)</gadget>
<output>200</output>

<gadget id="calculator">200 * (1/4)</gadget>
<output>50</output>

<result>50</result>