Read the book (1/4) on Monday, read (1/5) on Tuesday, read the rest (1/2) on Wednesday, read 18 pages on Thursday, 15 pages left in the book, and Monday How many pages did you read in total with Tuesday?
在星期一读了书的(1/4)，星期二读了(1/5)，星期三读了剩余的(1/2)，星期四读了18页，这本书还剩下15页，星期一和星期二一共读了多少页？
<gadget id="calculator">18 + 15</gadget>
<output>33</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(11/20) * (1/2)</gadget>
<output>11/40 = around 0.275</output>

<gadget id="calculator">1 - (1/4) - (1/5) - (11/40)</gadget>
<output>11/40 = around 0.275</output>

<gadget id="calculator">33 / (11/40)</gadget>
<output>120</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">120 * (9/20)</gadget>
<output>54</output>

<result>54</result>