Xiaohua reads a story book, and has already read (3/5) of the whole book, which is exactly 90 pages. How many pages does this book have?
小华看一本故事书，已经看了全书的(3/5)，正好是90页．这本书有多少页？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 / (3/5)</gadget>
<output>150</output>

<result>150</result>