Question

IQ test
1+5::[6]
2+5::[13]
3+5::[21]
4+5::[?]
best of luck​

Answer 1

Answer: 1 + 5 = 6

              2 + 5 = 13

13 - 6 = 7

            2 + 5 = 13

             3 + 5 = 21

21 - 13 = 8

              3 + 5 = 21

              4 + 5 = x

x - 21 = 9

9 + 21 = 30

Thus, 4 + 5 = 30