Xiaojun has been reading a 315-page book for 3 days, with an average of 35 pages per day, and the rest with an average of 42 pages per day. How many more days will it take? (Column comprehensive formula solution)
小军看一本315页的书，已经看了3天，平均每天看35页，剩下的平均每天看42页，还要看几天？(列综合算式解答)
<gadget id="calculator">35 * 3</gadget>
<output>105</output>

<gadget id="calculator">315 - 105</gadget>
<output>210</output>

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

<result>5</result>