Question

1+4=5 2+5=12 3+6=21 8+11=

Answer 1

21+8+11 equals to 40.
40 is your answer

Answer 2

1 + 4 = 5

2 + 5 = 7 but you have to add the 5 from the previous addition problem, and it'll give you 12

3 + 6 = 9 but you have to add the 12 from the previous addition problem, and it'll give you 21

If you continue the pattern (4+7, 5+8, 6+9, 7+10) then 8 + 11 will be 96.