There are some candies in a shopping mall, among which fruit candy is 5.6 yuan per kilogram, milk candy is 7.2 yuan per kilogram, and chocolate is 8.8 yuan per kilogram. Milk candy is 3 kilograms less than fruit candy and 2 kilograms more than chocolate. The average price of these candies is 7 yuan per kilogram , So, how many kilograms of chocolate.
某商场有一些糖果，其中水果糖每千克5.6元，奶糖每千克7.2元，巧克力每千克8.8元，奶糖比水果糖少3千克，比巧克力多2千克，这些糖果平均价格每千克7元、那么，巧克力有多少千克．
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">7.2 * 2</gadget>
<output>14.4</output>

<gadget id="calculator">5.6 * 5</gadget>
<output>28</output>

<gadget id="calculator">35 - 14.4 - 28</gadget>
<output>-7.4</output>

<gadget id="calculator">14 + (-7.4)</gadget>
<output>6.6</output>

<gadget id="calculator">5.6 - 7 - 7 - 7</gadget>
<output>-15.4</output>

<gadget id="calculator">8.8 + 7.2 + (-15.4)</gadget>
<output>0.6</output>

<gadget id="calculator">6.6 / 0.6</gadget>
<output>11</output>

<result>11</result>