exam Maths Puzzle Numerical Ability

How much of a 35% alcohol solution shoud be mixed with 2 liters of a 60% alcohol solution to produce a 50% alcohol solution?

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exam Other Question

what is the 5th square root of 1.63. I Cannot find this button on my calculator! Casey is 4yrs old and Jordan is 13 yrs. old .....

When will Casey be twice as old as Jordan?

can anyone help please need this for tomorrow morning....thank you very much