If an angle of a parallelogram is two-third of its adjacent angle, the smallest angle of the
parallelogram is
(a) 54°
(b) 72°
(c) 81°
(d) 108°

We know that in a parallelogram two opposite angles are equal -

Given -

Now, by using equation (1) :

Now, by putting the value of k in x and y.

Therefore, the right option and smallest angle is b) 72°.

the answer to the expression is 83