Tricia buys large bottles of iced coffee that have 6 servings per container.  She drinks half a container a day.  The coffee is currently on sale for $3.00 a bottle.  How much will it cost her to buy enough bottles to last for 2 weeks?
She drinks half a container of a 6 serving bottle of iced coffee a day so she drinks 6/2 = 
<gadget id="calculator">6/2</gadget>
<output>3</output>
3 servings a day.
There are 7 days in a week and she needs enough bottles to last for 2 weeks so that's 7*2 = 
<gadget id="calculator">7*2</gadget>
<output>14</output>
14 days.
She drinks 3 servings a day for 14 days so that's 3*14 = 
<gadget id="calculator">3*14</gadget>
<output>42</output>
42 servings.
Each bottle holds 6 servings and she drinks 42 servings in a week so she needs 42/6 = 
<gadget id="calculator">42/6</gadget>
<output>7</output>
7 bottles.
The iced coffee is on sale for $3.00 a bottle and she needs 7 bottles for a total of 3*7 = $
<gadget id="calculator">3*7</gadget>
<output>21</output>
21.00.

<result>21</result>