 
<translate> Ka X bụrụ ọnụ ahịa tiketi ndị okenye. Ya mere, ọnụ ahịa tiketi ụmụaka bụ X - 6. Ọnụ ego tiketi ise ahụ bụ X * 2 + 3 * (X - 6) = 77. X * 2 + 3 * X - 3 * 6 = 77. 5 * X - 18 = 77. 5 * X = 77 + 18 = 95. X = 19. Azịza ikpeazụ ya bụ: 19. <eng> Let X be the cost of an adult ticket. So the cost of a child ticket is X - 6. The total cost of the 5 tickets is X * 2 + 3 * (X - 6) = 77. X * 2 + 3 * X - 3 * 6 = 77. 5 * X - 18 = 77. 5 * X = 77 + 18 = 95. X = 19.
The final answer: 19. 