Guanghua Primary School bought back 2 accordions for 720 yuan and 3 accordions for 3150 yuan. How much more expensive is each accordion than the accordion?
光华小学购回2架手风琴共用去了720元，3架风琴共用去3150元，每架风琴比手风琴贵多少元？
<gadget id="calculator">3_150 / 3</gadget>
<output>1_050</output>

<gadget id="calculator">720 / 2</gadget>
<output>360</output>

<gadget id="calculator">1_050 - 360</gadget>
<output>690</output>

<result>690</result>