Uncle Zhang bought 3 chairs in the supermarket, paid the salesperson 100 yuan, and got 7 yuan back. How much is each chair on average?
张大伯在超市买了3把椅子，付给营业员100元，找回了7元，平均每把椅子多少钱？
<gadget id="calculator">100 - 7</gadget>
<output>93</output>

<gadget id="calculator">93 / 3</gadget>
<output>31</output>

<result>31</result>