book Maths Puzzle Numerical Ability

-(49/81)^1/2=?
-(216/125)^2/3

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book Other Question

A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100 mL of a 12%-saline solution. How much of the 10%-saline solution did the pharmacist use in the mixture? simplify the square root of 157