In Inhelder and Piaget's balance experiment, trial-and-error ...

[809779]

In Inhelder and Piaget's balance experiment, trial-and-error problem solving was most characteristic of
 
  unrealistic thought.
  concrete operational thought.
  logical thought.
  formal operational thought.

Question 2

Jeremy is 7 years old and has been asked to balance a scale with weights that can be hooked to the arms of the scale. Jeremy will probably
 
  solve the problem through a trial-and-error strategy.
  put weights on both sides without considering distance from the center of the
  scale.
  understand the inverse relationship between distance and weight.
  put all the weights on one side of the scale.

[Christopher]

Answer to Question 1

concrete operational thought.

Answer to Question 2

put weights on both sides without considering distance from the center of the
scale.