Answer:
The fraction of fish in Elena’s tank that are red guppies = 3/14
Step-by-step explanation:
The best way to go about this is to select an arbitrary value for the number of fishes in the tank.
Let the total number of fishes in the tank be 84.
Now out of this 85, 1/2 are guppies
The number of guppies fish = 1/2 * 84 = 42
Now, 3/7 of the guppies are red
The number of red guppies is thus 3/7 * 42 = 18 guppies
So the fraction of fishes in the tank which are red guppies will be ; 18/84 = 3/14
