Convert the question into tree diagrams. The number of people who visited a library in the last 5 months was 1210, 2100, 2550, 3160 and 3310. Draw the tree diagram of the total number of people who had used the library for the 5 months.
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Solution
People who visited the library for the past 5 months = 1210 + 2100 + 2550 + 3160 + 3310 = 12,330