Three workers Raja, Ravi, and Ratan are appointed to do a job. They together started the job but Ratan left after 3 days when 37% of the job was done. The remaining job was completed by Raja and Ravi in 7 days. The ratio of efficiency of Raja and Ravi is 4 : 5. What will be the number of days required by the slowest worker to complete the entire job alone?
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