Answer:
Step-by-step explanation
total fish = 100% = 20
guppies
x : 100 = 8 : 20
x = 800/20 = 40%
mollies
x : 100 = 6 : 20
x = 600/20 = 30%
catfish
x : 100 = 1 : 20
x = 100/20 = 5%
swordtails
x : 100 = 3 : 20
x = 300/20 = 15%
tetras
x : 100 = 2 : 20
x = 200 / 20 = 10%
