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47. According to paragraph 7, why would a 10-year-old be unable to solve algebra problems? (A) Algebra requires concrete operational thinking. (B) A 10-year-old has not reached the formal operational stage. (C) A child of 10 does not have logical reasoning abilities. (D) An algebra problem has too many steps in order to solve it.

48. In paragraph 8, the author mentions parents because (A) teenagers are already thinking about their roles in the future. (B) parents are very important teachers during the final stages of development. (C) the comparison of real and ideal parents is an example of abstract thinking, (D) adolescents tend to be critical of their parents as part of their development.

49. What can be inferred from the passage about people who are older than 15 years of age? (A) They must have completed all of Piaget's stages of cognitive development. (B) They are probably in the formal operational state of development. (C)They have mastered deductive reasoning and are beginning to learn intuitively. (D) They may still not be able to solve problems systematically. .

50. All of the following refer to Piaget’s theory EXCEPT (A) Even very young infants may engage in constructing the way that they understand the world (B) Both assimilation and accommodation are processes that we can use to help us adapt to new information. (C) When children learn more information, then their thinking is at a higher stage of development. (D)Operations require a more advanced stage of development than symbolic representation.

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