A book has 120 pages and can be read in two days. I read the whole book (2/5) on the first day, how many pages did I start from on the second day?
一本书有120页，两天读完．第一天读了全书的(2/5)，第二天从多少页读起的．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 * (2/5)</gadget>
<output>48</output>

<gadget id="calculator">48 + 1</gadget>
<output>49</output>

<result>49</result>