book Maths Puzzle Numerical Ability

How many liters of pure alcohol must be added to a 100-liter solution that is 20 percent alcohol in order to produce a solution that is 25 percent alcohol?

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book Other Question

Roz is twice as old as Grace. In 5 years the sum of their ages will be 28. How old are they now? express as the same function of a positive acute angle of sec -123 degress not using a calculator.