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Australian AMC 2008 - Middle Primary Question 15

AMC AUSTRALIA · Australian AMC 2008 - Middle Primary

Question 15

There is a stack of 45 blocks with one block on top, 2 blocks in the next row, 3 in the next row and so on. How many blocks are in the bottom row and how many rows are there?

Question illustration
  1. 9 blocks and 10 rows
  2. 10 blocks and 10 rows
  3. 8 blocks and 8 rows
  4. 6 blocks and 9 rows
  5. 9 blocks and 9 rows