The school bought 5 desks and 8 chairs and shared them at 1236 yuan. The unit price of desks is 180 yuan/piece. How much is the unit price of chairs?
学校买来5张办公桌和8把椅子，共用去1236元，办公桌单价是180元/张，椅子的单价是多少元/把？
<gadget id="calculator">180 * 5</gadget>
<output>900</output>

<gadget id="calculator">1_236 - 900</gadget>
<output>336</output>

<gadget id="calculator">336 / 8</gadget>
<output>42</output>

<result>42</result>