The school office bought a pack of white paper and planned to use 200 sheets per day, which can last for 28 days; due to the attention to saving paper, the actual 160 sheets per day, how many days did it actually take? (Answer with proportional knowledge)
学校办公室买来一包白纸，计划每天用200张，可以用28天；由于注意了节约用纸，实际每天160张，实际用了多少天？(用比例知识解答)
<gadget id="calculator">200 * 28</gadget>
<output>5_600</output>

<gadget id="calculator">5_600 / 160</gadget>
<output>35</output>

<result>35</result>