exam Maths Puzzle Numerical Ability

1. A tank holds 80 liters of a chemical solution. Currently the solution has a strength of 30%. How much of this should be drained and replaced with a 70% solution to get a final s

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exam Other Question
both sides of a parallelogram measure 8cm and 10 cm between them and form an angle of 120 degrees. calculate the lenght of their diagonal Evaluate ^4 SQRT 81 , if possible.