HELP! I am REALLY struggling!
16 = 1/4x + 2.5...where x stands for diameter of large gear16 - 2.5 = 1/4x13.5 = 1/4x....multiply both sides by 4, eliminating the 1/4 on the right side13.5 * 4 = x54 = x.....the large gear is 54 cm