A collection of free online brain teasers with answers. Let your brain have some fun with these brain games. Brain teaser game is a collection of brain teasers, puzzles, riddles, games and optical illusions.
Solution
-4
298 less 209 is 89
209 less 129 is 80
129 less 58 is 71
58 less -4 is 62
The result of each subsequent equation is 9 less than the previous one.
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