Xiao Li plans to finish reading a 290-page book within a week, and read 40 pages a day in the first two days. If he wants to finish reading as planned, how many pages should he read on average every day? (Solve with ratio)
小李计划在一周内读完一本290页的书，前两天每天读40页，如果要按计划读完，剩下的平均每天应读多少页？(用比例解)
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">290 - 80</gadget>
<output>210</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">210 / 5</gadget>
<output>42</output>

<result>42</result>