let total unit of work =LCM(90.40.12)=360 units Then A works 4 units, B works 9 units and C works 30 units of the work per day. So, total unit of work done by them in one round A=4×3=12 units B=9×2=18 units C=30×1=30 units Total work in one round =12+18+30=60 units and takes 6 rounds. So, they will paid Rs.240 in the ratio of 12: 18: 30 or 2: 3: 5 A=