How to use a number with several adjectives for its noun?

In teachings based on the behavior-oriented approach, general educational goals must be analyzed to the level of objective behavioral goals i.e. observable and measurable behaviors and be classified into the three areas of cognitive, psychomotor, and emotional.

There are three adjectives for areas: cognitive, psychomotor, and emotional areas. The part of text shown in bold seems weird because it uses of+[adjective]. Is the sentence correct as is or should I write three cognitive, psychomotor, and emotional areas? Why?

Answer

Could you just use a colon and leave out the “the”?

be classified into three areas: cognitive, psychomotor and emotional.

Attribution
Source : Link , Question Author : codezombie , Answer Author : rghome

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