Final answer:
The fraction of fish that are guppies or goldfish in the tank can be calculated by dividing the number of fish of each type by the total number of fish in the tank.
Step-by-step explanation:
The fraction of fish that are guppies or goldfish in the fish tank can be calculated by dividing the number of fish of each type by the total number of fish in the tank. In this case, there are 15 guppies and 112 goldfish, making a total of 15 + 112 = 127 fish.
So, the fraction of guppies in the tank is 15/127, which is approximately 0.118. And the fraction of goldfish is 112/127, which is approximately 0.882.
Therefore, the equation that most closely estimates the fraction of fish that are guppies or goldfish in the fish tank is:
Guppies: 0.118
Goldfish: 0.882