Xiao Ming went to the stationery store and bought 5 exercise books and 3 rulers, Xiao Lian bought 3 rulers and 8 exercise books, Xiao Ming paid 7.5 yuan less than Xiao Lian. How much is each exercise book? (column or text description)
小名去文具店买了5本练习本和3把尺子，小莲买了3把尺子和8本练习本，小名比小莲少付了7.5元．每本练习本多少元？(列式或用文字说明)
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">7.5 / 3</gadget>
<output>2.5</output>

<result>2.5</result>