Students A and B spend the same amount of money to buy exercise books. After buying, A gets 10 more books than B, so A gives B 2 yuan. How much is each exercise book?
甲、乙两个学生拿出相等的钱去买练习本，买好后甲比乙多拿10本，因此甲给乙人民币2元．每本练习本多少钱？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>