Kobayashi reads a 156-page story book. He reads 36 pages on the first day and finishes the rest in 3 days. How many pages does he need to read on average every day?
小林读一本156页的故事书，第一天读了36页，剩下的要3天读完，平均每天要读多少页？
<gadget id="calculator">156 - 36</gadget>
<output>120</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<result>40</result>