Six boxes of bees can produce 390 kilograms of honey a year. Xiaohuan's family has 12 boxes of these bees. How many kilograms of honey can be produced in a year?
6箱蜜蜂一年可以酿390千克蜜，小欢家养了12箱这样的蜜蜂，一年以酿多少千克蜂蜜？
<gadget id="calculator">390 / 6</gadget>
<output>65</output>

<gadget id="calculator">65 * 12</gadget>
<output>780</output>

<result>780</result>