The aquarium has a scale model of a great white shark for sale in their gift shop if the scale model is 2 in.: 7 ft, which is the actual length of the shark

The picture in the attached figure

we know that
scale factor=2 in/ 7 ft-----> 2/7
scale factor=measure in the model/measure in the actual
measure in the actual=measure in the model/scale factor
in this problem
measure in the model=5 in
scale factor=2/7

measure in the actual=5/(2/7)----> 5*7/2-----> 17.5 ft

the answer is
17.5 ft