Six workers can plaster the exterior of a building in 5 hours. If the job is to be completed in 3 hours 45 minutes, how many workers will be needed?
Three workers can do a job in 28 hours. How many more workers are needed to do this job in 12 hours?
If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours? (2 marks)
If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours? (Answer in numbers)