Xiaohong and Xiaoming go shopping in the supermarket. Xiaohong bought 6 sticks of jelly, each at 2.1 yuan. Xiaoming bought 2 pieces of chocolate, which cost 3 yuan more than Xiaohong. How much is each piece of chocolate?
小红和小明去超市购物，小红买了6支果冻，每支2.1元，小明买了2块巧克力，比小红多花3元，每块巧克力多少元？
<gadget id="calculator">2.1 * 6</gadget>
<output>12.6</output>

<gadget id="calculator">12.6 + 3</gadget>
<output>15.6</output>

<gadget id="calculator">15.6 / 2</gadget>
<output>7.8</output>

<result>7.8</result>