Mingming bought 6 exercise books, and Lan Lan bought 3 of the same exercise books, which cost 1.35 yuan more than Lan Lan. How much is each exercise book?
明明买了6本练习本，兰兰买了3本同样的练习本，明明比兰兰多花1.35元．每本练习本多少元？
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">1.35 / 3</gadget>
<output>0.45</output>

<result>0.45</result>