I would say the answer is B. 8 1/2 because 11/20 is close to 10/20 which would be the same as 1/2
3=0.45 + 0.15x
2.55=0.15x
2.55/0.15=x or 17 gallons of water added=x
-5.25 to the nearest tenth is -5.3.
You first must find the 18% of the fish population.
You multiply 500 by .18 . You are supposed to get 90.
90 is the 18% fish increase.
Then you just add 500 + 90 and you will get 590 fish that are now in the school.