exam Maths Puzzle Numerical Ability

2 times sq. root of x minus sq. root of 2x+1=1

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can you tell me how to solve X problems

x-3x*x The weight of 1m^3 of air is approximately 1.3 x 10^3 g. Suppose that the volume of air inside of a building is 3 x 10^6 m^3. How much does the air inside the building weigh?