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5-67.

Hadrosaurs, a family of duck-billed, plant-eating dinosaurs, were large creatures with thick, strong tails. It has recently been determined that hadrosaurs probably originated in North America.

Scientists in Alaska recently found a hadrosaur footprint like the one at right that measured $14$ inches across. It is believed that the footprint was created by a young dinosaur that was approximately $27$ feet long. Adult hadrosaurs have been known to be $40$ feet long. How wide would you expect a footprint of an adult hadrosaur to be? Show your reasoning.

Set up a proportional equation comparing foot size and length in adult and juvenile hadrosaurs.

See the example below, one of several possibilities.

$\frac{\text{juvenile foot size}}{\text{adult foot size}}=\frac{\text{juvenile length}}{\text{adult length}}$

Around $20.7$ inches