The number of books owned by Xiaoying (1/4) is equal to 20% of the number of books owned by Xiaoqiang. It is also known that Xiaoqiang has 10 more books than Xiaoying. How many books does Xiaoqiang have?
小英拥有图书册数的(1/4)与小强拥有图书册数的20%相等，又知小强比小英多10册图书．小强有书多少册？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<result>50</result>