Tiffany is going to the beach and wants to make sure she has enough sunscreen. She knows she needs to re-apply sunscreen after 2 hours. She also knows she needs 3 ounces of sunscreen each application and a bottle contain 12 ounces and costs $3.5. If she is there for 16 hours, how much will the sunscreen cost?
She needs to apply sunscreen 8 times because 16 / 2 = 
<gadget id="calculator">16/2</gadget>
<output>8</output>
8.
She will use 24 ounces of sunscreen because 3 x 8 = 
<gadget id="calculator">3*8</gadget>
<output>24</output>
24.
This will take 2 bottles because 24 / 12 = 
<gadget id="calculator">24/12</gadget>
<output>2</output>
2.
This will cost $7 because 2 x 3.5 = 
<gadget id="calculator">2*3.5</gadget>
<output>7</output>
7.

<result>7</result>