The greatest number of rows Li Na can plant is 9
Solution:
Given that Li Na is going to plant 63 tomato plants and 81 rhubarb plants
Li Na would like to plant the plants in rows where each row has the same number of tomato plants and each row has the same number of rhubarb plants
To find: greatest number of rows Li Na can plant
To find the greatest number of rows of plants we have to list the factors of 63 and 81 and find the greatest common one
The factors of 63 are: 1, 3, 7, 9, 21, 63
The factors of 81 are: 1, 3, 9, 27, 81
Then the greatest common factor of 63 and 81 is 9
Thus greatest number of rows Li Na can plant is 9