Xiao Ming reads a book a day, and reads part of it in the morning. At this time, the ratio of the number of pages he has read to the number of pages he has not read is 1:9, and he reads 60 more pages in the afternoon than in the morning. How many pages are there in this book?
小明一天读一本书，上午读了一部分，这时已读了页数与未读的页数的比是1：9，下午比上午多读60页，这本书共有多少页．
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(9/10) - (1/10)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 / (4/5)</gadget>
<output>75</output>

<result>75</result>