Answer:
After 4 decades, the population of fishes in the pond becomes 48,000 fishes
Step-by-step explanation:
We are told to find the population of fishes in a pond after 4 decades given that the population of the pond doubles after each decade.
A decade is a period of 10 years
For the first decade, the population becomes 3,000 * 2 = 6,000 fishes
For the second decade, the population becomes 6,000 * 2 = 12,000 fishes
For the third decade, the population becomes 12,000 * 2 = 24,000 fishes
and lastly for the fourth decade, the population becomes 24,000 * 2 = 48,000 fishes
