Xiaoya reads a 195-page story book. She has already read 90 pages, and the rest reads 15 pages a day. How many days will it take Xiaoya to finish this book?
小亚看一本195页的故事书，已经看了90页，剩下的每天看15页，小亚看完这本书还要用多少天？
<gadget id="calculator">195 - 90</gadget>
<output>105</output>

<gadget id="calculator">105 / 15</gadget>
<output>7</output>

<result>7</result>