There are 605 desks in the school, 138 are damaged, and 250 are bought. How many desks does the school have now?
学校课桌有605张，损坏138张，又买加250张，学校现在有课桌多少张？
<gadget id="calculator">605 - 138</gadget>
<output>467</output>

<gadget id="calculator">467 + 250</gadget>
<output>717</output>

<result>717</result>