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These tricky problems seem perfectly straightforward. At first.
Difficulty: 1 of 5 Latest: Ones and Zero Operation Outcome Rating: 4.00
+-----------------+
|1 + 1 + 1 + 1 + 1|
|1 + 1 + 1 + 1 + 1|
|1 + 1x0 + 1 = ?  |
+-----------------+
Consider the abovementioned addition and multiplication problem.

Determine the number that will replace the mark of interrogation, given that it is NOT 12.

Notes:

  1. All the calculations are in the decimal (base 10) system. Calculations done in non-decimal system is NOT permissible.
  2. Although this puzzle is in "tricks" category, some amount of logical thinking must be enunciated while solving this problem.
(Solution Posted, 3 Comments) Submitted on 2023-01-02 by K Sengupta   
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