exam Maths Puzzle Numerical Ability

If 19 kilos of gold loses 1 kilo and 10 kilos of silver loses 1 kilo when weighted in water, find the weight of the gold in a bar of gold and silver weighing 106 kilos in air and 99 kilos in water?

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can you tell me if this is the correct answer
simplify (6x^3+5x^2-2)-(11x^3-2x+8)=6x^3-11x^3+5x^2+2x-2-8=5x^3+5x^2+2x-10

Thirty one times the total of towice t and 2 is greater than or equal to -6