The school newly purchased 50 sets of desks and chairs (1 desk and 1 chair are 1 set), and the total cost is 5600 yuan. It is known that each desk costs 70 yuan, and how much is each chair.
学校新采购了50套课桌椅(1张课桌和1把椅子是1套)，共用去5600元，已知每张课桌需要70元，每把椅子多少元．
<gadget id="calculator">5_600 / 50</gadget>
<output>112</output>

<gadget id="calculator">112 - 70</gadget>
<output>42</output>

<result>42</result>