exam Maths Puzzle Numerical Ability

An air sample 4.0 ppm (parts per million) of two pollutants. The concentration of one is four times the other. What are the concentrations?

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Can you please show a breakdown to this? So I understand how to do these types of algebra problems? Thanks 16-5(3t-4)=8(-2t+11) a piece of wire is shaped to enclose a square, whose area is 121sq. in. it is then reshaped to enclose a retangle whose length is 13in. What is the area of the retangle in square inches?