Answer:
40000 total visitors
Explanation:
Let p represent a multiplier. Then the total number of visitors to the park is
4p + 7p + 9p = 40000.
This simplifies to 20p = 40000, so that p = 2000.
Then the number of children who visited is 4p = 8000; the number of women is 7p = 14000, and the number of men is 9p = 18000.
Summing up these results gives us the total number of chidren, women and men who visited the zoo last year: 8000 + 14000 + 18000, or 40000.