Please answer the following question by reasoning step-by-step.
Nine adults went to a play with seven children. Adult tickets are $11 each and children's tickets are $7 each. How many dollars more did the adults' tickets cost in total than the children's tickets in total?

50
Adults = 9 * 11 = 99.

Children = 7 * 7 = 49.

Difference: 99 - 49 = $50.

The adults' tickets cost $50 more than the children's tickets.

.

Final answer: 50