There are 1500 squares in total on the 5 pages of manuscript paper, each page has 15 lines, how many squares are there on average in each line?
5页原稿纸共有方格1500个，每页稿纸有15行，平均每行有几个方格？
<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<gadget id="calculator">1_500 / 75</gadget>
<output>20</output>

<result>20</result>