Q10
Who had solved the largest number of puzzles by the 20-th minute from the start of the competition?
Answer: B
Reading the charts (completion time, in minutes, of each puzzle):
| Puzzle | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Anirbid | 4 | 9 | 11 | 14 | 19 | 22 | 27 | 29 | 33 | 37 |
| Chandranath | 4 | 6 | 10 | 13 | 17 | 21 | 23 | 26 | 28 | 30 |
| Koushik | 2 | 4 | 7 | 12 | 14 | 16 | 19 | 25 | 29 | 31 |
| Suranjan | 5 | 7 | 12 | 18 | 21 | 23 | 26 | 28 | 30 | 35 |
From the visual-puzzle chart, Koushik's visual puzzles were completed at 2, 12, 25, 29, i.e. puzzles 1, 4, 8, 9 (Anirbid: 4, 14, 29, 33; Suranjan: 5, 18, 28, 30; the same positions). So the visual puzzles are #1, #4, #8, #9 and the number-based puzzles are #2, #3, #5, #6, #7, #10.
Puzzles solved by minute 20: Koushik 7 (7th at minute 19), Anirbid 5, Chandranath 5 (6th only at 21), Suranjan 4 (5th at 21). Koushik leads.
Hence, the answer is (B) Koushik.