Additional question: Xiao Li reads a book of fairy tales. She reads (1/4) in the first week and the rest (2/5) in the second week. What percentage of the whole book does Xiao Li read?
附加题：小莉看一本童话书，第一周读了(1/4)，第二周又读了余下的(2/5)，小莉共读了全书的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) * (2/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/4) + (3/10)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>