The cost of each adult's ticket for a certain concert was $30, and the cost of each child's ticket for the concert was $

[M7MBA]

The cost of each adult's ticket for a certain concert was $30, and the cost of each child's ticket for the concert was $24. If Hannah purchased tickets for this concert, what was the average (arithmetic mean) cost per ticket?

(1) Hannah purchased twice as many children's tickets as adult's tickets.
(2) Hannah purchased 4 children's tickets.

[spoiler]OA=A[/spoiler]

Source: GMAT Prep