Mr. and Mrs. Boyden take their 3 children to a leisure park. They buy tickets for the whole family. The cost of an adult ticket is $6 more than the cost of a child ticket. The total cost of the 5 tickets is $77. What is the cost of an adult ticket?
Step-by-step reasoning:
19
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 answer: 19