Let us assume the number of turtles = x Then Number of frogs = x + 4 Number of crayfish = 2x + 3 Total number of turtles and crayfish = 54 Then we can write the equation as x + 2x + 3 = 54 3x + 3 = 54 3x = 54 - 3 3x = 51 x = 51/3 = 17 Then The number of frogs = x + 4 = 17 + 4 = 21 So there are 21 frogs in the pond that has been counted by Ramon.