Answer:
21 days.
Explanation:
To solve this, divide the cost of lunch from the initial amount in his account. Therefore:
58.19 = 2.74x ('x' being the number of days)
Divide both sides by 2.74:
x ≈21.24, or 21 days.
***Since you use whole numbers when counting days, round down to determine the amount of days he can buy lunch. Thus, he can buy lunch for 21 days.