Answer: $0.85
Step-by-step explanation:
Let the cost of a bag of chips be x.
Given : A student bought two juice pouches for $1.25 each and 3 bags of chips.
Then , the total cost will be :-

Since, the total cost was $5.05.
Then, the equation to determine the cost of a bag of chips would be :-

Subtract 2.5 from both sides , we get

Divide both side by 3 , we get

Hence, the cost of a bag of chips= $0.85 or 85 cents [∵ 1 dollar = 100 cents]