>>Several people answered 40
>>I can get 52 or 96, but not 40.
>>What am I missing?
>
>
>It's easy, Bill
>
>On each row, the number on the right = the sum of two numbers on the left added to the number on the right above
>
>So,
>
>2nd row : 2 + 5 + 5 = 12
>3rd row: 3 + 6 + 12 = 21
>4th row: 8 + 11 + 21 = 40

Why is 4th row 8+11, rather than 7+10 (Or Marcia's 4+7) ?
I know I am getting old but still do not see it :-)