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