It takes four painters working at the same rate $1.25$ work-days to finish a job. If only three painters are available, how many work-days will it take them to finish the job, working at the same rate? Express your answer as a mixed number
The answer is 2 1/8.
If it takes four painters 1.25 days to finish a job, it would take one person 5 days to finish the same job. If this five days is divided into 3 people, it will take 5/3 days for them to complete the job.