The school bought 7 sets of the same desks and chairs, among which the desks cost 105.7 yuan and the chairs cost 77.7 yuan. How much does each table cost per chair?
学校买来7套同样的桌椅，其中桌子共花了105.7元，椅子共花了77.7元．每张桌子比每把椅子贵多少元？
<gadget id="calculator">105.7 - 77.7</gadget>
<output>28</output>

<gadget id="calculator">28 / 7</gadget>
<output>4</output>

<result>4</result>