EH i think b cause the nicle is the point
The equation is 0+91=91. This is because 91+0=91. So, x=91.
Answer:
If the problem is,

By finding it,
Take a 5 box grid in which each box represents 1 unit,
Then take 1 box of this grid,
Repeat this step,
Finally, Add them,
We get,
A grid having 10 boxes with 2 taken boxes,
Thus, 
When we do these steps for three grids we will get
,
That is, by multiplying the result of
by 3 we will obtain 
