Li Ming took 15.6 yuan to sell school supplies, and bought a pen for 4.7 yuan and a science book for 6.5 yuan. How much money does he have left?
李明带着15.6元钱去卖学习用品，买了一支4.7元的钢笔和一本6.5元的科技书，他还剩多少钱？
<gadget id="calculator">4.7 + 6.5</gadget>
<output>11.2</output>

<gadget id="calculator">15.6 - 11.2</gadget>
<output>4.4</output>

<result>4.4</result>