First, find how many servings one corn plant produces by multiplying the number of carrot servings by 5: 4 servings * 5 = <<4*5=20>>20 servings
Then find how many servings one green bean plant produces by dividing the number of corn servings by two: 20 servings / 2 = <<20/2=10>>10 servings
Now multiply the number of servings per carrot plant by the number of carrot plants: 4 servings/plant * 9 plants = <<4*9=36>>36 servings
Do the same for corn: 20 servings/plant * 9 plants = <<20*9=180>>180 servings
And do the same for green beans: 10 servings/plant * 9 plants = <<10*9=90>>90 servings
Now add up the servings for all three types of plant: 36 servings + 180 servings + 90 servings = <<36+180+90=306>>306 servings
#### 306