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IMAS 2025–2026 Upper Primary — First Round Question 8

IMAS · IMAS 2025–2026 Upper Primary — First Round

Question 8

Some marbles are arranged in several rows. In each turn, a number of marbles is moved from one row to another such that the number of marbles moved equals the number of marbles in the target row just before the move. For example, there are 9 marbles that are arranged in 2 rows, as shown in the diagram below. One valid move and one invalid move are also shown.
Question illustration
Now, as shown in the diagram below, 24 marbles are arranged in three rows: 11 in the first row, 7 in the second row and 6 in the third row. Using the same procedure as above, what is the minimum number of turns required such that each row contains exactly 8 marbles?
Question illustration
  1. 2
  2. 3
  3. 4
  4. 5
  5. Greater than or equal to 6