Final answer:
The fraction of adults in the restaurant is 5/8, which equates to 60 adults when calculated against the total of 96 diners.
Step-by-step explanation:
If 3/8 of the diners are children, then the remaining fraction that represents the adults in the restaurant is 1 - 3/8 = 5/8. To find out how many adults that represents, you multiply the total number of diners by the fraction of adults. So, 5/8 of 96 diners equals to:
(5/8) × 96 = 60.
Therefore, 5/8 of the diners are adults, and there are 60 adults in the restaurant.