Two parallel lines are cut by two transversal segments which intersect in the interior of the parallel lines. if this intersection bisects one of the transversals, must it bisect the other as well. why or why not?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)