Question

1+4 = 5 , 2+5 = 12 , 3+ 6 = 21 , 8 + 11 = 40 how to get 8+ 11 = 40

Answer 1

1+4=5

now add 5 to the second equation

5+2+5=12

similarly add 12 to the third equation

12+3+6=21

add 21 to the fourth equation

21+8+11=40

This adding the result of the first sum gives us the answer of the second

Answer 2

well the answer is very easy.................it is a type of logic ques.......
            1+4=5     okkkk
             then add 5  to another equation
             2+5+5=12
            then add 12 to next eq
               3+6+12=21
     then add 21 to next eq
                 8+11+21=40
  i think so u got iit
have a nice day