The school bought 8 desks and some chairs, and paid a total of 442.8 yuan. Each desk was 35.6 yuan, which was 19.8 yuan more expensive than each chair. How many chairs did you buy?
学校买8张课桌和一些椅子，共付了442.8元，每张桌子35.6元，比每把椅子贵19.8元，买了多少把椅子？
<gadget id="calculator">35.6 * 8</gadget>
<output>284.8</output>

<gadget id="calculator">442.8 - 284.8</gadget>
<output>158</output>

<gadget id="calculator">35.6 - 19.8</gadget>
<output>15.8</output>

<gadget id="calculator">158 / 15.8</gadget>
<output>10</output>

<result>10</result>