we can see that
We know that, in a parallelogram the opposite angles are equal to each other, this means that
hence, we have that
Now, from the figure, we can see that, in the triangle ADB, we know angle ADB=47 and angle DAB=78.
Since all interior angles of a triangle add up 180, we have
and from this equality, we can find angle ABD. It yields
hence, the answer is ABD=55 degrees