Math
posted by Anonymous .
Jill wants to put 45 sunflower plants, 81 corn plants, and 63 tomato plants in her garden. if she puts the same number of plants in each row and if each row has one type of plant, what is the greatest number of plants Jill can put in one row?

What is a common factor of
45
81
63? 
I need help

22515

9 plants in each row