Which is a unit rate?
15 miles per gallon
5 pounds in 2 bags
$8 for 3 boxes of crackers
22 gallons in 5 days

15 miles per gallon  is a unit rate.

Step-by-step explanation:

Consider the provided information.

We need to find the unit rate.

Unit rate can be describes as how many units of the first type of quantity corresponds to one unit of the second type of quantity.

Now consider the provided options.

Option A) 15 miles per gallon

This options tell us that 15 miles is corresponds to one unit or one gallon.

Therefore, 15 miles per gallon  is a unit rate.

Option B) 5 pounds in 2 bags

This options tell us that 5 pounds is corresponds to 2 unit or 2 bag.

Which is not the unit rate.

Option C) $8 for 3 boxes of crackers

This options tell us that $8 is corresponds to 3 unit or 3 boxes of cracker.

Which is not the unit rate.

Option D) 22 gallons in 5 days

This options tell us that 22 gallons is corresponds to 5 days.

Which is not the unit rate.

Therefore, 15 miles per gallon  is a unit rate.

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step-by-step explanation:

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step-by-step explanation: