Answer: 20 is the correct option.
Step-by-step explanation:Given that a pet store has 115 fish that need to be placed into fish tanks and each tank hold 6 fish.
We are to find the number of tanks that the store need.
We will be using the UNITARY method to solve the given problem.
Number of tanks needed to store 6 fishes = 1.
So, number of tanks needed to store 1 fish will be
Therefore, number of tanks needed to store 115 fishes is given by
× 155 =
= 19
= 19.16.
Since we cannot have 0.16 tank, so we need one tank more than 19 to store all fishes.
Thus, the store needs 20 tanks for 115 fishes.
Hope this helps :)