13 + 11 + 6 = 11
You need to rotate ball with number 9 to get 6...
Solve this 5 boxes puzzle, what will be the value of the middle box in 3rd set ?
2 2 2=6 3 3 3=6 4 4 4=6 5 5 5=6 6 6 6=6 7 7 7=6 8 8 8=6 9 9 9=6
If four letters are put into four envelopes at random, what is the probability that only three of the letters are put into the correct envelopes?