Two brothers go to buy a children's comic book. If the elder brother buys it, the difference is 4.4 yuan. If the younger brother buys it, the difference is 5.6 yuan. If the two buy this book together, it will be 3 yuan more. You know this book price?
兄弟两人去买一本儿童漫画书，如果让哥哥来买还差4.4元，若用弟弟的钱来买还差5.6元，两人合买这本书又多3元，你知道这本书的价钱吗？
<gadget id="calculator">3 - 1.2</gadget>
<output>1.8</output>

<gadget id="calculator">5.6 + 1.8 + 1.2 + 4.4</gadget>
<output>13</output>

<result>13</result>