During a food festival. The number of customers who buy Chinese food is three times the number of customers who buy Western food. It is known that the number of people who buy Chinese food is 600 more than the number of people who buy Western food. How many customers bought Chinese food in this food festival? (solution with equation)
某次美食节中．购买中餐的顾客是购买西餐顾客人数的3倍．已知购买中餐的人数比购买西餐的人数多600人．该次美食节中购买中餐的顾客有多少人？(用方程解答)
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">600 / (2/3)</gadget>
<output>900</output>

<result>900</result>