Xiaoqiang and Xiaoming each have several books. It is known that Xiaoqiang's books accounted for 60% of the total books of the two. When Xiaoqiang lent 20 books to Xiaoming, the ratio of the number of books between Xiaoqiang and Xiaoming was 2:3. How many books do they have together?
小强和小明各有图书若干本．已知小强的图书占两人图书总数的60%，当小强借给小明20本后，小强和小明图书本数的比是2：3．两人一共有图书多少本？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / (1/5)</gadget>
<output>100</output>

<result>100</result>