exam Maths Puzzle Numerical Ability

How much pure acid is in 520 milliliters of a 16% solution?

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exam Other Question

solve using the quadratic formula
this problem is taken from a homework sheet on quadratic equations, can you please show me the necessary steps involed in completing this problem.

x^2-3x-3=-5 Given that a * b = 270 and GCD(a,b)=5, find LCM (a,b).