The kindergarten bought 14 small tables and 28 small stools and paid a total of 840 yuan. Each small table is 12 yuan more expensive than each small stool. How much is each small stool?
幼儿园买来14张小桌和28只小凳，共付840元．每张小桌比每只小凳贵12元，每只小凳多少元？
<gadget id="calculator">14 * 12</gadget>
<output>168</output>

<gadget id="calculator">840 - 168</gadget>
<output>672</output>

<gadget id="calculator">28 + 14</gadget>
<output>42</output>

<gadget id="calculator">672 / 42</gadget>
<output>16</output>

<result>16</result>