There used to be 203 books on the bookshelves of the six-year class, 99 books were borrowed out before school on Friday, and 60 books were returned. How many books are there in total on the bookshelves now? how many copies
六年一班图书架上原有203本书，星期五放学前借出去99本，还回来60本，现在的图书架上一共有书多少本？多少本
<gadget id="calculator">203 - 99</gadget>
<output>104</output>

<gadget id="calculator">104 + 60</gadget>
<output>164</output>

<result>164</result>