Question

A camera attached to a telescope photographs a stars image once every .045 seconds. How many complete images can the camera capture in 3 seconds?

Answer 1

Writing and solving an equation of ratios would seem to be the best way to go.

0.045 sec       3 sec
------------- = ------------
1 image           x

Then 0.045x = 3, and x = 66 2/3 images, best rounded down to  66 images.