2012 AMC 10A Problems/Problem 14: Difference between revisions
Created page with "Chubby makes nonstandard checkerboards that have <math>31</math> squares on each side. The checkerboards have a black square in every corner and alternate red and black squares ..." |
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Solution | |||
There are 15 rows with 15 black tiles, and 16 rows with 16 black tiles, so the answer is <math>15^2+16^2</math> <math>\boxed{\mathrm{ (B)}\ 481}</math> | |||
Revision as of 20:45, 8 February 2012
Chubby makes nonstandard checkerboards that have 
squares on each side. The checkerboards have a black square in every corner and alternate red and black squares along every row and column. How many black squares are there on such a checkerboard?
Solution
There are 15 rows with 15 black tiles, and 16 rows with 16 black tiles, so the answer is 
