exam Maths Puzzle Numerical Ability

-5(3w-3)+(1+16w)=0

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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? If the sides of a square are increased by 3 in, the area is increased by 39 in. What were the dimensions of the original square?