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Answer

Each symbol is 3 kilograms, and there are 8 symbols for paper. So weight of paper is $3\times8 = 24$ kilograms.

There are 2 symbols for glass. So weight of glass is $3\times2=6$ kilograms.

There are 4 symbols for plastic. So weight of plastic is $3\times4 = 12$ kilograms.

There are 6 symbols for aluminum. So weight of aluminum is $3\times6=18$ kilograms.

Add up the weights of all types: $24 + 6+12 + 18=60$ kilograms.