Answer:
9 rows
Explanation:
Given that:
Li Na wants to plant 63 tomato plants and 81 rhubarb plants
However, Li Na was hoping with the mindset to plant the plants in rows;
where each row possesses the same number of tomato plants and rhubarb plants.
So;
Suppose we choose a given number, Let's say (9) to be the divisor for both the number of tomato plants and rhubarb plants;
Then
63/9 tomato plants = 7 tomato plants
81/9 rhubarb plants = 9 rhubarb plants
Therefore, the greatest number of rows Li Na can plant 7 tomato plants and 9 rhubarb plants = 9