The bookstore is running a promotion, each English dictionary is 48 yuan, buy 5 and get 1 free. Teacher Wang buys 5 books at a time, how much is each book cheaper?
书店搞促销，每本英语字典48元，买5本送1本．王老师一次买5本，每本可便宜多少钱？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">48 * (5/6)</gadget>
<output>40</output>

<gadget id="calculator">48 - 40</gadget>
<output>8</output>

<result>8</result>