Answer: 1/3
Step-by-step explanation:
If 1/3 of the school garden has vegetables and another 1/3 has flowers, then the combined portion used for vegetables and flowers is 1/3 + 1/3 = 2/3.
To find the part of the garden left to grow grass, you subtract this combined portion from 1 (the whole garden):
1 - 2/3 = 3/3 - 2/3 = 1/3
So, 1/3 of the garden is left to grow grass.