Xia Jun collected 26 animal pictures and 17 landscape pictures. Give 15 cards to classmates, how many cards are left?
夏军收集了26张动物画片和17张风景画片．送给同学15张，还剩多少张？
<gadget id="calculator">26 + 17</gadget>
<output>43</output>

<gadget id="calculator">43 - 15</gadget>
<output>28</output>

<result>28</result>