Final answer:
To find out how many cans of dog food Alexis's dog needs for a week, multiply 2/3 (the daily amount) by 7 (the number of days in a week), which equals 14/3. This results in 4 whole cans plus 2/3 of a can, so Alexis will need to purchase 5 cans in total.
Step-by-step explanation:
The student is asking how many cans of dog food are needed if a dog eats 2/3 of a can each day and the calculation is for a week. To solve this, we need to multiply the daily amount of food by the number of days in a week.
Daily consumption: 2/3 of a can
Number of days in a week: 7 days
To find the weekly consumption, we calculate:
2/3 can/day × 7 days/week = (2/3) × 7 = 14/3 = 4 whole cans with 2/3 of a can remaining
Alexis will need to buy 5 cans to make sure her pet dog has enough food for the entire week, as she cannot purchase 2/3 of a can.