Question

A model of a dinosaur was created using a scale factor of 1:20. The model is 3.75 feet long. How long is the actual dinosaur in feet?

Answer 1

75 feet

Step-by-step explanation

The scale factor means that the ratio of the model to the actual size of the dinosaur is 1 : 20.

The model is 3.75 feet long.

Let the actual length of the dinosaur be x.

So, it means that:

`\begin{gathered} (1)/(20)\text{ = }(3.75)/(x) \\ \text{Cross}-\text{ multiply:} \\ 1\cdot\text{ x = 20 }\cdot\text{ 3.75} \\ x\text{ = 75 feet} \end{gathered}`

The actual length of the dinosaur is 75 feet.