Liangliang bought 6 exercise books, and Yanyan bought 3 exercise books. Each exercise book costs 0.5 yuan, how much does Liangliang spend more than Yanyan?
亮亮买了6个练习本，燕燕买了3个练习本．每个练习本0.5元钱，亮亮比燕燕多花多少钱？
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">3 * 0.5</gadget>
<output>1.5</output>

<result>1.5</result>