6 out of 11 = 29 out of ???
We shall start by representing the ??? with letter y.
This means 6 out of 11 = 29 out of y
We can simplify the left hand side to become
6 out of 11 = 5
That means 5 = 29 out of y
Simplify the right hand side to become
29 out of y = y - 29
Therefore,
5 = y - 29
We now have an equation
Add 29 to both sides of the equation (to eliminate the -29 on the right hand side)
5 + 29 = y - 29 + 29
34 = y
So the expression now becomes;
6 out of 11 = 29 out of 34