Logan is making a guitar. he measures the total length from the bridge to the nut as 650 millimeters (mm). logan plans to put 20 frets, or dividers, between the nut and the bridge, starting from the nut. at first, he places each consecutive fret by subtracting 22.5 mm from the previous length, starting with the total length from the bridge to the nut. however, after doing some research, he learns that each fret should be measured out at ! "! of the previous length.