It depends on what you mean by 2'11 and 1'9. The notation is not unique.
2 ft 11 inches + 1 ft 9 inches = 4 ft 8 inches
2 minutes 11 seconds + 1 min 9 sec = 3 min 20 sec.
44 + 555 + 211 = 810
The sum is: 22+212+211 = 445
1 + 211 = 212
6489+211=6700
7*8+(1/5)*20+211 = 7*8+4+211 = 56+4+211 = 271
1 + 210 = 211
353
59 + 61 + 67 + 71 + 73 + 79 + 83 + 89 + 211 = 793
The question is the equivalent to asking for the solution to the equation: 149 + x = 211 (solve for x) It is 149 plus 62 = 211, i.e. x = 62
1 + 211 = 212 - 12 = 200.
The answer is 672.
123 plus 88 equals 211