### 11 Answers

99 because there is a difference of 3 between 2 and 5. So, there has to be a difference of 3 between the others. So, 9-6=3!!

99

99

99, there are many ways, but the easiest is 2-55, 4-77, 6-99

2-55

or

2+4- 5+4, 5+4

or

6-99

so the answer is 99

2 : 55 => add all digits and result is 12 , do the same for 6 : all answers and you will get 33 as the correct answer as result matches to 12.

so If i treat the black box function as taking 2 input numbers to add and produce a result of 12 [ sum of their digits ] then it will solve the problem unambiguously. I.e only one answer will fit the solution which is good 🙂

2-55

6-99

99

Just as ‘tin_knocker_al’ told, you may see that figure ‘5’ is almost rotated form of figure ‘2’ (it is exactly in 7-segments display). So we must rotate the figure ‘6’ to get ‘9’.

2-55

6-99

7-LL