A person X is twice as good a workman as a person Y. By working together, they complete a job in 18 days. Find the number of days in which person X as well as Y can complete the job, respectively, if each of them works separately.

If 18 men working 7 hours a day can prepare 14 school uniforms in 20 days, then in how many days can 12 men working 6 hours a day prepare 18 school uniforms?

Raju alone can complete a work in 36 days, and Raj alone can complete the same work in half the time taken by Raju. How many days will they take together to complete 14 of the total work?