exam Maths Puzzle Numerical Ability

when you double a number & add 22, you get 5/8 of the original number-what is the original number?

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exam Other Question

two jets are traveling towards each other and are 4000 km apart. The rate of one jet is 100 km/h faster than the rate of the other. if the jets pass each other after 2.5 hours, what is the rate of the faster jet? 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?