A book, Xiao Zhang reads the whole book (1/15) every day, and there are 60 pages left after 5 days, how many pages does this book have?
一本书，小张每天读全书的(1/15)，5天后还剩下60页没有读，这本书共有多少页？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">5 * (1/15)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 / (2/3)</gadget>
<output>90</output>

<result>90</result>