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well that is an easy one

Answer in feet cubed is :

X = 80 x (12/12) x (18/12)

X = 80 x 1 x 1.5

X = 120 cubic Feet

1 cubic yard = 27 Cubic F

so

Y = 120 / 27

Y = 4.44

Now typically you would order some extra to cover for spillage

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