exam Maths Puzzle Numerical Ability

Chapter:The Elimination Method
2m=2-9n
21n=4-6m

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exam Other Question

Please help me siplify the following:

{[8/27)^3:(2/3)^2]^4:(4/9)^10}:(2/3)^6

Thank you
Rosanna A garden area is 30ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?