Given :
Claudia spends $2.15 day for lunch.
Her cafeteria lunch account has a balance of 48.00 .
To Find :
The maximum number of days, d that she can eat without adding money to her lunch account.
Solution :
Number of days she can eat without adding money in her account is :

But, number of days cannot be in decimal.
Therefore, maximum number of days she can eat without adding money to her lunch is 22 days.