A designer builds a model of a canoe. The finished model is exactly the same shape as the original, but smaller. The scale factor is 2:7. (a) Find the ratio of the width of the model to the width of the original.
(b) Find the ratio of the surface area of the model to the surface area of the original.
(c) Find the ratio of the volume of the model to the volume of the original,
Write these ratios in the format m:n.