The three members of Xiao Ming's family drank 4200 ml of milk in total last week. How many ml does each person drink on average per day?
小明一家三人上星期共喝牛奶4200毫升，平均每人每天喝多少毫升？
<gadget id="calculator">4_200 / 7 / 3</gadget>
<output>200</output>

<result>200</result>