Lan Lan plans to read a book of fairy tales in 10 days. Since she read 5 more pages than planned every day, she finished it in 8 days. How many pages did she plan to read each day?
兰兰计划用10天看完一本童话书．由于她每天比计划多看5页，结果8天就看完了．她原计划每天看多少页？
<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>