A garden initially has 400 flowers, including some orchids. The gardener planted 'F' more orchids in the garden such that the number of orchids became 20% of the total number of flowers in the garden now. If the initial number of orchids was 20, find the value of F.

In a town with 30,000 professionals, teachers make up 11% of the total professionals. If 46% of teachers are male, what is the number of female teachers in the town?

In a town's professional breakdown, doctors represent 18% and clerks represent 8% of the total professionals. If the number of doctors is 3000 greater than the number of clerks, what is the total number of professionals in the town?