exam Maths Puzzle Numerical Ability

Pleas show me how to find the least common denominator. thanks!

t^2-7t+12, t^2-4t, t.

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exam Other Question

please help me with this problem.

r + (-12)= -34 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%?