A new book of the same kind should be packaged into several packages of the same size. When all (3/8) were taken, there were still 25 books left after being packed into 4 packs, and when all were picked up, they were just packed into 8 packs, and all the new books of this batch were packed. How many books of this kind are there?
同一种新书，要包装成大小相同的若干包．取来全部的(3/8)时，包装成4包后还剩25本，全部取来时，又正好包装成8包，这批新书全部包装完．这种书共有多少本？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) / 8</gadget>
<output>5/64 = around 0.078125</output>

<gadget id="calculator">(5/64) * 4</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">(3/8) - (5/16)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">25 / (1/16)</gadget>
<output>400</output>

<result>400</result>