The perimeter of a square picture frame is 48 inches. One side length of the frame is 30.48 centimeters. How many centimeters are in an inch?

We have ##2.54## ##cm## in each inch.
Perimeter of a square is four times its side.
As perimeter is ##48## inches
each side is ##48/4=12## inches
Hence ##12## inches is ##30.48## ##cm##
Hence we have ##30.48/12=2.54## ##cm## in each inch.