exam Maths Puzzle Numerical Ability

Twenty years ago Horace was one fifth as old as he is now. How old is he now?

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1.How many liters of 22% salt solution must be added to 75 liters of 67% salt to get a 47% salt solution?

2. How many gallons of a 40% alcohol solution should be mixed with 15 gallons of 80% solution to obtain a 60% alcohol solution? NOTE: Figure in the book. Given numbers are also differnt.
In the figure 25-31, the battery has a potential difference of V = 10.0 V and the five capacitors each have a capacitanc