Twenty-one bought 8 desks and 12 chairs, and spent a total of 817.6 yuan. It is known that each chair is 15.8 yuan. How much is each table? (solution by equation)
二十一小买来8张办公桌和12把椅子，共花去817.6元，已知每把椅子15.8元，每张桌子多少元？(用方程解)
<gadget id="calculator">15.8 * 12</gadget>
<output>189.6</output>

<gadget id="calculator">817.6 - 189.6</gadget>
<output>628</output>

<gadget id="calculator">628 / 8</gadget>
<output>157/2 = around 78.5</output>

<result>157/2 = around 78.5</result>