Camille placed blocks on a table in rows and columns. All the rows and columns had the same number of blocks in them and formed a square. Which could be the total number of blocks Camille placed on the table?
A. 111 blocks
B. 121 blocks
C. 181 blocks
D. 222 blocks
Answer (2)
If all the rows and columns have the some number of blocks, then
(number of blocks in each row) times (number of blocks in each column)
must be a perfect square.
'121' is the only choice on the list that's a perfect square. It's the square of 11.
The total number of blocks Camille could have placed on the table must be a perfect square. Among the options, only 121 blocks is a perfect square ( 11 X 11). Thus, the correct answer is B. 121 blocks.
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