Answer:
There are 52 other plants are in the garden.
Explanation:
Number of grape tomato plants in garden = 18
Number of cheery tomato plants in garden = 20
Number of other plants = x
Total plants in the garden = P
Fraction of grape tomato in garden=


P = 90
P = 90 = 18 + 20 +x
x = 52
There are 52 other plants are in the garden.