+-----------------+ |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:
- All the calculations are in the decimal (base 10) system. Calculations done in non-decimal system is NOT permissible.
- Although this puzzle is in "tricks" category, some amount of logical thinking must be enunciated while solving this problem.
