book has read 60 pages. Just the rest (1/4). How many pages does this book have?
一本书已经看了60页．正好是剩下的(1/4)．这本书一共有多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 / (1/4)</gadget>
<output>240</output>

<gadget id="calculator">240 + 60</gadget>
<output>300</output>

<result>300</result>