Question

During a bake sale, 1 and 1/2 dozen cookies were sold in 1/3 hour. what is the unit rate for the dozens of cookies sold per hour?

Answer 1

Find the number of cookies:

$\text {Cookies = } 1 \dfrac{1}{2} \text { dozens}$

Since 1 dozen = 12:

$\text {Cookies = } 1 \dfrac{1}{2} \times 12$

Change to improper fraction:

$\text {Cookies = } \dfrac{3}{2} \times \dfrac{12}{1}$

Simplify:

$\text {Cookies = } 18$

18 cookies were sold in 1/3 hour:

$\dfrac{1}{3} \text { hour = } 18 \text { cookies}$

$\text {1 hour = } 18 \times 3 \text { cookies}$

$\text {1 hour = } 54 \text { cookies}$

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Answer: Unit rate for cookies sold = 54/hour
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