Math Question = an aquarium holds 6 and 1/4 gallons of water. the water level dropped to 4/5 of this amount .how much water should be added to fill the aquarium



Above is my son's math question and we can't figure out how to solve it. The possible answers are: 74 and 1/2 / 10 and 3/4 / 8 / 1 and 5/8 / 9 / 3 and 1/6

2 answers

5/5 - 4/5 = 1/5

(1/5) * (25/4) = 25/20 = 1 5/20 = 1 1/4 gallons
an aquarium holds 6 and 1/4 gallons of water. the water level dropped to 4/5 of this amount .how much water should be added to fill the aquarium