exam Maths Puzzle Numerical Ability

One thousand liters of a solution was available, but the solution was 90% alcohol. Jim needed a solution which was 80%percent alcohol. How many liters of alcohol had to be extracted so that the solution would be 80% alcohol?

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exam Other Question
when you double a number & add 22, you get 5/8 of the original number-what is the original number? how do i go about simplifing this to the simplest form?
x-13/x^2-x-12+3x-3/x^2-x-12