What are the dimensions of the image at fraction 1 over 2 times its current size?

Length = 4 inches, width = 5 inches
Length = 6 inches, width = 8 inches
Length = 10 inches, width = 12 inches
Length = 16 inches, width = 20 inches

What are the dimensions of the image at fraction 1 over 2 times its current size Length 4 inches width 5 inches Length 6 inches width 8 inches Length 10 inches class=