Xiaohong has been reading a storybook for 5 days, with an average of 27 pages per day, and there are 15 pages left. How many pages does this storybook have?
一本故事书，小红已看了5天，平均每天看27页，还剩下15页没有看，这本故事书一共有多少页？
<gadget id="calculator">27 * 5</gadget>
<output>135</output>

<gadget id="calculator">135 + 15</gadget>
<output>150</output>

<result>150</result>