When Zhang Cong reads a storybook, he read 10 pages less than the whole book (1/5) on the first day, 12 pages more than the whole book (1/6) on the second day, and finally there are 150 pages left. How many pages does this book have?
张聪看一本故事书，第一天看的比全书的(1/5)少10页，第二天看的比全书的(1/6)多12页，最后还剩下150页．这本书共有多少页？
<gadget id="calculator">150 - 10</gadget>
<output>140</output>

<gadget id="calculator">12 + 140</gadget>
<output>152</output>

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

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/5) - (1/6)</gadget>
<output>19/30 = around 0.633333</output>

<gadget id="calculator">152 / (19/30)</gadget>
<output>240</output>

<result>240</result>