In a factory there are 3 machines to perform a job. The newest machine can do the job in 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all three machines together?

Mercantile Bank Ltd Mercantile Bank Ltd - Officer - 2006 গণিত ঐকিক নিয়ম (Unitary method) 2006