exam Maths Puzzle Numerical Ability

A brick patio is twice as long as it is wide. It is bordered on all sides by a garden 1.5m wide. Find the dimensions of the patio if the area of the garden is 54m2.

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Simpliy: This is so complicated please help.

2/z^2 - 3/2 / 2/5z^2 + 1/3z
i have to find the volume of a right cone with a radius 6 cm and height 10 cm.
i have to leave answer in terms of pie.