In the adjoining figure, O is the center of the circle. If angle BOC = 140°, the value of x is :
70°
30°
40°
20°
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The mean of 6 different data is 12. If 5 of these data are 16, 18, 12, 13 and 8; the sixth data is :
63
6 × 12
5
12 × 3
The centroid of triangle ABC is G = (6, -3). If A = (-6, -3), B = (x, 6) and C = (9, y), then the values of x and y are :
x = 6, y = 15
x = 15, y = -12
x = 15, y = 6
x = -15, y = 6
