Need Help With Math

Question

Alexis has an 8-pound bag of dog food. If she feeds her dog 0.45 pounds of dog food each day, estimate how many days the bag will last.

Answer 1

8/.45 = 800/45 = 160/9 = 17 7/9 days = 17.777... = about 17 days and 19 hours

round it off to 18 days,

but

on the 18th day the dog will get 7/9 of its usual dinner and might be a little hungry

it usually gets 0.45 pound of dog food, on the 18 day just 0.35 pound of dog food