There are 657 science and technology books in the school library, 245 less than literature and art books. An additional 128 storybooks would equal the number of literature and art books. Based on this information, ask you to ask a mathematical problem and answer it.
学校图书室有科技书657本，比文艺书少245本．故事书再增加128本就和文艺书的本数同样多．根据这些信息请你提出一个数学问题并解答出来．
<gadget id="calculator">245 - 128</gadget>
<output>117</output>

<gadget id="calculator">657 + 117</gadget>
<output>774</output>

<result>774</result>