The school bought 8 desks and 20 chairs for a total of 1860 yuan. It is known that each desk is 120 yuan. How much is each chair?
学校买了8张办公桌和20把椅子，一共花了1860元，已知每张办公桌120元，每把椅子多少钱？
<gadget id="calculator">120 * 8</gadget>
<output>960</output>

<gadget id="calculator">1_860 - 960</gadget>
<output>900</output>

<gadget id="calculator">900 / 20</gadget>
<output>45</output>

<result>45</result>