Explanation:

- To find the average number of women who visited the zoo on Tuesday and Saturday, we first determine the number of men who visited on these days.

- On Tuesday, 35% of 100 people were men: \( 0.35 \times 100 = 35 \) men. Thus, the number of women is \( 100 - 35 = 65 \).

- On Saturday, 65% of 300 people were men: \( 0.65 \times 300 = 195 \) men. Thus, the number of women is \( 300 - 195 = 105 \).

- Average number of women on Tuesday and Saturday: \( \dfrac{65 + 105}{2} = 85 \).

- Option 1 (75): Incorrect, as it doesn't match the calculated average.

- Option 2 (65): Incorrect, as it's the number of women on Tuesday only.

- Option 3 (95): Incorrect, as it exceeds the calculated average.

- Option 4 (85): Correct, it matches our calculated average.

- Option 5 (55): Incorrect, as it's lower than any single day's women count.