exam Maths Puzzle Numerical Ability

what is the absolute value of [ 2x-8] = 0
(the brakets are the absolute value symbols)

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exam Other Question

Mike, louie and Joy can mow the lawn in 4,6, and 7 hours, respectively. What fraction of the yard can they mow in hour if they work together? a rectangular shaped parking lot is to have a perimeter of 524 yards. if the width must be 58 yards becuase of a building code, what will the length need to be?