It takes nine litres of paint to paint an area of [[$ 60 \;\text {m}^2 $]]. How much paint is needed (at the accuracy of the nearest liter) if

a) an area of [[$ 45 \;\text {m}^2 $]] is painted?

Answer: litres.

b) an area of [[$ 145 \;\text {m}^2 $]] is painted?

Answer: litres.

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