There are 364 story books, 87 more than technology books. How many books are there in total?
故事书有364本，比科技书多87本，两种书一共有多少本？
<gadget id="calculator">364 - 87</gadget>
<output>277</output>

<gadget id="calculator">277 + 364</gadget>
<output>641</output>

<result>641</result>