Answer:
21 days.
Step-by-step 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:
[tex]\frac{58.19}{2.74} = \frac{2.74x}{2.74}[/tex]
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.