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

How do i solve y=0.5x+2 and -y=-2x+4 by systems of substitution?
divide a number by 8 and subtract 3 from the result and the answer is 13