Students A, B, and C buy the same exercise book together with the same amount of money. Both A and B have 6 more books than C. A and B give C 2.4 yuan respectively, so how much is each exercise book.
甲、乙、丙三个同学拿同样多的钱合买同样的练习本，甲和乙都比丙多6本，甲、乙分别给丙2.4元，那么每本练习本多少元．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">2.4 / 3</gadget>
<output>0.8</output>

<result>0.8</result>