Book Maths Puzzle Percentage

How many liters of a mixture containing 80% alcohol should be added to 5 liters of 20% solution to yield a 30% solution?

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Book Other Question

What is the single logarithm of ln 5 +2ln x-3ln(x2+1)?



What is the single logarithm of 2log5x+3log5y-4log5z
draw the graph of this function x-1/2*x^2+3.find the domain and the range.
draw the graph of this fuction -3*x+1/2*x-1.find the domain and the range.