Only number 1. Need asap. Show the solutions as well as brief explanation or formula used. Will give thumbs up

OPERATIONS IN SETS In a barangay, every family either has 1 senior citizen, or 1 teenager or both, It was found out that there are 3xy senior citizens, 25x teenagers and there are 15x families with both senior citizen and teenager. Find how many families has 1 senior citizen only and how many families has 1 teenager only. $. If A = [x. y. 2), B = [1, 2, 3, 7, 8, 9, 12, 35) U = (x, y, z, 1. . 50. ), find: AUB, AnB, A'. A.B