3 groups of 7 numbers each are made from positive integers from 1 to 21, inclusive. What is the highest possible median

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3 groups of 7 numbers each are made from positive integers from 1 to 21, inclusive. What is the highest possible median of the medians of these 3 groups?

A. 10
B. 11
C. 12
D. 14
E. 17.5

Answer: D

Source: e-GMAT
Source: — Problem Solving |