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1. Minimum respondents on the twelfth day ●●●○○ 50 ptsDuring the first eleven days, 700 people responded to a survey question. Each person chose exactly one of three options, and the ratio of the numbers of responses was $4:7:14$. On the twelfth day, several more people responded, so that the number of responses for each option did not decrease and the ratio became $6:9:16$. What is the minimum number of people who must have responded on the twelfth day?