Initially i found it difficult to understand how loops execute,variables changes during each iteration and when loop starts. So i started solving these problems one by one 1. Frog in a well: A Frog falls into a 60-foot-deep well. During the day it climbs 2 feet. During the night it slips down 0.5 feet. It escapes immediately when it reaches the top. Python code: well_depth = 60 frog_position = 0 day = 0 while frog_position < well_depth: day = day + 1 frog_position = frog_position + 2 if frog_position >= well_depth: print("Frog escapes on day:",day) break frog_position = frog_position - 0.5 print("Total_days:",day) Output: Frog escapes on day:40 Total days:40 2. The Saint's Flower Basket A saint visits 7 temples. At each temples,he offer half of the flowers in his basket. After visiting all 7 temples,he has exactly one flower remaining. We need to calcuate how many flowers he had initially. flowers = 1 temples = 7 while temples>0: flowers = flowers*2 temples = temples - 1 print("Initial Flowers:",,flowers) Initial flowers:128 3. TenaliRaman and the Palace Guards *Tenali Raman receives 1024 lashes from the King. At each gate,he gives half of his remaining lashes to the guard. We need to find how many guards receive a share when he has one hash remaining. * lashes = 1024 guards = 0 while lashes>1: share = lashes/2 print("Guard receives:",share) lashes = lashes - share guards = guards + 1 print("Remaining lashes:",lashes) print("Total guards",guards) Total guards:10 remaining lashes:1 4. Police and Thief Problem: The police and thief start at different positions. police starts at 0 feet thief starts at 30 feet police moves 5 feet in each round. Thief moves 2 feet in each round. Both move simulatenously until they meet. police = 0 thief = 30 while police != thief: police = police + 5 thief = thief + 2 print("Police:",police,"Thief:",thief) print("They meet at:" police) Police: 5 Thief: 32 Police: 10 Thief: 34 Police: 15 Thief: 36 Police: 20 Thief: 38 Police: 25 Thief: 40 Police: 30 Thief: 42 Police: 35 Thief: 44 Police: 40 Thief: 46 Police: 45 Thief: 48 Police: 50 Thief: 50 They meet at: 50 5. Two Trains: Two trains stop at regular intervals. train 1 stops at every 3rd station. train 2 stops at every 5th station. We need to find: 1. All common stations. 2. The first common station. 3. The last common station. since total number of stations is not specified. i asked the user to enter it. total_stations = int(input("Enter total number of stations: ")) station = 1 last_station = 0 print("Common stations:") while station <= total_stations: if station % 3 == 0 and station % 5 == 0: print(station) if first_station == 0: first_station = station last_station = station station = station + 1 print("First common station:", first_station) print("Last common station:", last_station) Output(for 100 stations): Common stations: 15 30 45 60 75 90 First common station: 15 Last common station: 90 My key takeaways: _ first we need to understand the problem,identify the variables ,decides the loop condition and how the values change during each iteration. iteration mean one complete execution of code inside a loop.