David Wolfe has published a very simple math problem, but many have been involved, which is actually not as easy as it seems. At first, you may think that a primary school student could solve it, but it may prove much harder. Test yourself!
Grab a piece of paper and a pencil, write down the puzzle below and try to figure it out. There are two solutions to the problem.
If you have not been able to solve it, we will show you the right answers.
Most people start this way: 1 + 4 = 5. Then, the result (5) is added the digits in the next line (2 and 5), and the result is 12.
Now move on to the third row: 3 + 6 = 9, and then add 9 to the result of the previous row; the sum you obtain is 21.
Now, to find the number to replace the question mark, you add 8 + 11 = 19, to which you add the 21, the sum in the previous row, and the final result is 40 will.
Obviously, 1 + 4 = 5, but some people see it as 1+ (1 × 4) = 5. Starting with this logic, 2 + (2 × 5) = 12, 3 + (3 × 6) = 21, and 8+ (8 × 11) = 96.