Given that △+□=34, □+○=45, ○+☆=48, try to find how much △+☆=.
已知△+□=34，□+○=45，○+☆=48，试求△+☆=多少．
<gadget id="calculator">45 - 34</gadget>
<output>11</output>

<gadget id="calculator">48 - 11</gadget>
<output>37</output>

<result>37</result>