Leon and Turtle Aquarium - Math riddle

Explanation :  


1 turtle in each tank = 1 turtle too many

2 turtles in each tank = 1 tank too many

Using one of the better known heuristic to solve this question

Before that, we know that:

2 turtles in each tank = 1 tank too many

2 turtles in each tank = 2 turtles short

First, find the difference in the number of turtles in the two scenarios:

First scenario = 1 turtle too many

Second scenario = 2 turtles short

Difference in turtles = 1 - (- 2)

Difference in turtles =  3

Second, find the difference in the distribution of turtles:

First scenario = 1 turtle each tank

Second scenario = 2 turtles each tank

Difference in turtle = 2 - 1

Difference in turtles = 1

Find the number of tanks:

Number of tanks = 3 ÷ 1

Number of tanks = 3

Find the number of turtles:

Using the first scenario, there was one turtle too many

Number of tanks = 3

Number of turtles = 3 + 1

Number of turtles = 4

There are 4 turtles and 3 tanks.