19¼*4-4*18½ = 77/4*4-4*37/2=77-74=3
19¼*4-4*18½ = 77/4*4-4*37/2 = 77-2*37= 77-74=3
19¼*4-4*18½=77/4*4-37/2*4=77-74=3