Respuesta :
the variable is how many tanks there are because he wants to know how many fish there are in the whole aquarium and we already know each tank contains five fishes but we just need to know how many tanks there are. :)
The variable needed to calculate next is the total number of tanks in aquarium.
What is Unitary Method?
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
If there are 5 fish in each tank.
If he wants to know how many total fishes are there in aquarium.
He needs to find out how many tanks are there present.
If he the total number of tanks then by the quantity of one tank he can multiply it and then get the required answer.
Hence, next he needs to find the total number of tanks in aquarium.
Learn more about Unitary method here:
https://brainly.com/question/23423168
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