Question

Greta bought three 15-pounds bags of dry dog food.Her dog eats 10 ounces of dry dog food each day.After how many days will Greta need to buy more dog food?

Answer 1

72 days

there are 720 ounces total (convert 45 pounds to 720 ounces)
divide that by the 10 ounces per day and get 72 days

Answer 2

Answer:  Greta needs to buy more dog food after 72 days.

Step-by-step explanation:  Given that Greta bought three 15-pounds bags of dry dog food and her dog eats 10 ounces of dry dog food each day.

We are to find the number of days after which Greta need to buy more dog food.

We know that

$\textup{1 pound}=16~\textup{ounces}\\\\\Rightarrow \textup{3\times 15 pounds}=16\times3\times15=720~\textup{ounces}.$

Let Greta needs to buy more dog food after x days.

Then, according to the given condition, we have

$10\times x=720\\\\\Rightarrow 10=\dfrac{720}{10}\\\\\Rightarrow x=72.$

Thus, Greta needs to buy more dog food after 72 days.