You should be able to set up a proportion between the sides something like (18+x)/x=(56+21)/56
Answer:
18
Step-by-step explanation:
because 20% of 90 is 18
Answer: 6 gallons
Step-by-step explanation:
4 gallons of water for 30 plants
turn into ratio
4:30
simplify
2:15
multiply both sides by 3 to get 45 plants
6:45
6 gallons for 45 plants