Faxin Food Co., Ltd. plans to produce 690 tons of tofu this month, and has already produced 150 tons. The rest is planned to be produced within 3 weeks. How many tons of tofu will be produced on average per week?
法新食品有限公司这个月计划生产豆腐690吨，已经生产了150吨，剩下的计划在3个星期内全部生产完，平均每个星期要生产豆腐多少吨？
<gadget id="calculator">690 - 150</gadget>
<output>540</output>

<gadget id="calculator">540 / 3</gadget>
<output>180</output>

<result>180</result>