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TCS Other Question

A, B, C and D go for a picnic. When A stands on a weighing machine, B also climbs on, and the weight shown was 132 kg. When B stands, C also climbs on, and the machine shows 130 kg. Similarly the weight of C and D is found as 102 kg and that of B and D is 116 kg. What is D's weight?? L&B&H of a cube in the ratio 3:2:1 and L doubled and B & H are halved.then % of decrease in volume of a cube?