###Human: There are 18 green leaves on each of the 3 tea leaf plants. One-third of them turn yellow and fall off on each of the tea leaf plants.  How many green leaves are left on the tea leaf plants?, ### Assistant: In total, the 3 tea leaf plants have 18 x 3 = 54 green leaves.
One-third of the yellow leaves falling off of all plants is 54 / 3 = 18.
The number of remaining green leaves on the plants is 54 - 18 = 36. 
 So the answer is :  36