△, 口 and ○ each represent a number, know that △+□=15, 口+○=16, △+○=17, what is the sum of △, 口, ○.
△、口和○各表示一个数，知道△+□=15，口+○=16，△+○=17，△、口、○的和是多少．
<gadget id="calculator">15 + 16 + 17</gadget>
<output>48</output>

<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<result>24</result>