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a lift can carry up to 8 persons
a-d, a, a+d = 3a
Average = a = 62
Weight of three = 3 x 62 = 186 kg
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E,F,G weights are increasing AP
bd, b, b + d = 3b
Total weight = 186 + 3b
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Average weight of people in the lift is 66 kg
Weight = 66 x 6 = 396 kg
186 + 3b = 396
3b = 210
b = 70
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Weight of F = 70 kg