It costs 480 yuan to buy a desk, which is 30 yuan more expensive than buying 10 chairs. How much does a chair cost?
买一张办公桌需要480元，比买10把椅子贵30元．一把椅子的价钱是多少元？
<gadget id="calculator">480 - 30</gadget>
<output>450</output>

<gadget id="calculator">450 / 10</gadget>
<output>45</output>

<result>45</result>