exam Maths Puzzle Numerical Ability

What precent of 120 is 15?

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exam Other Question

Please help me solve and why the answer is not a negative.
If y=square root of 0 + 2. Floor plans for a building have the four corners of a room located at the points (2,3),(11,6),(-3,18), and (8,21). Determine whether the side through the points (2,3) and (11,6) is perpendicular to the side through the points (2,3) and (-3,18).