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The average weight of A ,\ B and C is...

The average weight of `A ,\ B` and `C` is 40 kgs. Weight of `C` is 24 kgs more than `A` s weight and 3 kgs less than `B` s weight. What will be the average weight of `A ,\ B ,\ C` and `D` . If `D` weights 15 kgs less than `C` ? (a) 42 kgs (b) 40 kgs (c) 36 kgs (d) 38 kgs

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