Are the two triangles congruent?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?