exam Maths Puzzle Numerical Ability

1) Simplify: (2x4y0 /z2)- 5

2) Simplify: (152x7y2 )/ (150x9y)

3) Write in scientific notation: 5,754,000,000

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The area of a square is 25 square meters. What is its perimeter? A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400 square foot, what is the width of the path?