Teaching CSIR NET Mock Test Series Quantitative Aptitude Elementary Statistics

The median of the data 9, 12, 11, 8, 16, 18, 10, 14, 15, 13, 17, 20, 2, 24 is x . If 2 and 8 are replaced by 21 and 18 in this data, respectively, then the median of the data so obtained is y. What is the value of (3x - y)?

1
26
2
25 
3
24.5 
4
23.5
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