A,B,C weigh in AP

a-d, a, a+d = 3a

Average = a = 62

Weight of three = 3 x 62 = 186 kg

&nbps;

E,F,G weights are increasing AP

b-d, b, b+d = 3b

Total weight = 186 + 3b

&nbps;

Average weight of people in the lift is 66 kg

Weight = 66 x 6 = 396 kg

186 + 3b = 396

3b = 210

b = 70

&nbps;

Weight of F = 70 kg

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