exam Maths Puzzle Numerical Ability

please help me the question is a take home test.

in chemistry class, 9 liters of a 4% SILVER IODIDE solution must be mixed with a 10% solution to get a 6% solution. how many liters of the 10% solution are needed?

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exam Other Question
For a sample of size n = 100, proportion p = 0.6, and at a 95% confidence level, the upper bound of the portion is: -5(3w-3)+(1+16w)=0