Xiaoying bought 4 exercise books, paid 6.5 yuan, and got back 0.3 yuan. How much is each exercise book?
小英买了4本练习本，付出6.5元，找回0.3元．每本练习本多少元？
<gadget id="calculator">6.5 - 0.3</gadget>
<output>6.2</output>

<gadget id="calculator">6.2 / 4</gadget>
<output>1.55</output>

<result>1.55</result>