There were 758 storybooks in the reading room of the Central Primary School. Students borrowed 85 in the morning and returned 69 in the afternoon. How many story books are there now?
中心小学阅览室原有故事书758本，上午同学们借走85本，下午还回69本．现在有故事书多少本？
<gadget id="calculator">758 - 85</gadget>
<output>673</output>

<gadget id="calculator">673 + 69</gadget>
<output>742</output>

<result>742</result>