12 men and 18 boys, working 15/2 hours a day, can do a piece of work in 60 days. If a man works equal to 2 boys, then how many boys will be required to help 21 men to do twice the work in 50 days, working 9 hours a day ?

• ক 42 ✅ সঠিক উত্তর
• খ 40
• গ 36
• ঘ 30