exam Maths Puzzle Numerical Ability

A reeces big cup has a diameter of 2 inches and 0.8 inches. a reese's bar has dimensions 4 inches by 0.8 inches by 0.5 inches. using approzimations, which candy has more peanut but

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5x to the -4th power 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