exam Maths Puzzle Numerical Ability

Evaluate ^4 SQRT 81 , if possible.

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exam Other Question

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 Can someone help me with this problem?

I need to add 3/8 + 5/8 in the lowest terms.

Thanks,
Sher