The number of pupils must be 1 more than a common multiple of 3, 4, and 9.
Find the LCM of 3, 4, and 9, then add 1.AGS Rule Box
| LCM of 3, 4, 9 | = | 36 (since 36 is the smallest number divisible by 3, 4, and 9) |
| Total pupils | = | 36 + 1 = 37 |
Final Answer: 37