To solve this problem, we need to understand the pattern in the given equations and use it to find the value of the unknown in the last equation.

Pattern in the given equations:
- The left side of each equation is the sum of two numbers.
- The right side of each equation is the product of those two numbers.

Using this pattern, we can find the value of the unknown in the last equation as follows:

Solution:
- Let the two numbers in the last equation be x and y.
- Then, according to the pattern, we have:
- x + y = 11 (from the left side of the equation)
- x * y = ? (from the right side of the equation)
- To find the value of x * y, we can use the same pattern in the previous equations:
- For the first equation, we have: 1 + 4 = 5 and 1 * 4 = 4. So, x = 1 and y = 4.
- For the second equation, we have: 2 + 5 = 7 and 2 * 5 = 10. So, x = 2 and y = 5.
- For the third equation, we have: 3 + 6 = 9 and 3 * 6 = 18. So, x = 3 and y = 6.
- For the fourth equation, we have: 8 + 11 = 19 and 8 * 11 = 88. So, x = 8 and y = 11.
- Therefore, for the last equation, we have:
- x + y = 11 (from the left side of the equation)
- x * y = 8 * 11 = 88 (from the right side of the equation)
- So, the value of the unknown is 88.

Answer: The value of the unknown in the last equation is 88.

1+4=5
5+2+5=12
12+3+6=21
21+4+7=32
32+5+8=45
45+6+9=60
60+7+10=77
77+8+11=96
thus , 8+11 is 96 riddle solved.
hope it will help