exam Maths Puzzle Numerical Ability

How long will it take $8000 to triple itself if it is invested at 6% simple interest.

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a tank holds 80 liters of a chemical solution. currently, the solution has a strenght of 30%. how much of this solution must be drained and replaced with a 70% solution to get a strenght of 40%? Please Help Me solve this:

What are the asymptotes of the functions "f(x) = 3x" and "g(x) = log52x