He obviously wants to buy a composition book at 22.70 yuan, but with his current money plus 5.90 yuan, he can just buy one. After Mingming bought a 10.80 yuan comic book with his current money, how much money would he have left?
明明想买一本22.70元的作文书，他现在的钱再添上5.90元正好可以买一本．明明用他现在的钱买一本10.80元的漫画书后，还剩多少钱？
<gadget id="calculator">22.7 - 5.9 - 10.8</gadget>
<output>6</output>

<result>6</result>