Ascanner scanned 56 photos in 7 minutes. if it scans photos at a constant rate, it can scan photos in 27 minutes. numerical answers expected!

Writing and solving an equation of two ratios would be one of the easier ways to solve this problem.

56 photos          x
=
  7 min            27 min

x is found as follows:  (56 photos)(27 minutes) = (7 min)(x)

Divide both sides by (7 min) to get the answer, x, which is measured in "photos."