Jaya, a shopkeeper, initially had 'n' pens. A customer bought 10% of the pens. Then, another customer bought 20% of the remaining pens. After that, one more customer purchased 25% of the remaining pens. Finally, Jaya was left with 270 pens. How many pens were there initially in her shop?

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?