state gov UP Police Head Operator (Radio Cadre) Mock Test Quantitative Aptitude Average

If the mean of 8 observations x ,  x + 2,  x + 4,  x + 6,  x + 8,  x + 10,  x + 12,  x + 14 is 15, then the mean of last 3 observations is

1
20
2
18
3
22
4
19
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