exam Maths Puzzle Numerical Ability

Simplify: (25)1/2(27)-1/3
note- the 1/2 and -1/3 are exponents

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exam Other Question

Draw a line segment and a point outside the line. Construct a line through the point that is perpendicular to the segment. A reboncing ball rebounces each time to a height equal to one half the height of the previous bounce. If it is dropped from a height of 16 mtrs. find the total distance it has travelled when it hits ground for the 10th time.