Xiaohong bought 3 copies of "Brain Teasers", paid 20 yuan, and got back 5.6 yuan. How much is each "Brain Teasers"?
小红买了3本《脑筋急转弯》，付20元，找回5.6元，每本《脑筋急转弯》多少元？
<gadget id="calculator">20 - 5.6</gadget>
<output>14.4</output>

<gadget id="calculator">14.4 / 3</gadget>
<output>4.8</output>

<result>4.8</result>