exam Maths Puzzle Numerical Ability

If i perform 1,214 glucoses for a month. I review 289 glucoses of the 1,214 and found 12 errors. What is my percentage of error?

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exam Other Question

Solve (5a-4) = a+16/a+1 Find the weight of a snow ball 4 feet in diameter if the wet compact snow of which this ball was made weighs 30 pounds per cubic feet.Show solution and formulas.