What percentage of well-educated Americans in their late adolescence/early 20s were able to solve the combination-of-liquids task?

Name: What percentage of well-educated Americans in their late adolescence/early 20s were able to solve the combination-of-liquids task?
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Research indicates that only about 30 to 40 percent of well-educated Americans in their late adolescence or early 20s can solve the combination-of-liquids task, which is a measure of formal operational thinking.

What Percentage of Well-Educated Americans in Their Late Adolescence/early 20s