Meena bakes 5 dozen cookies for the school’s bake sale.  She sells 2 dozen cookies to her biology teacher, Mr. Stone.  Her friend Brock buys 7 cookies, and her friend Katy buys twice as many as Brock.  How many cookies does Meena have left?
Meena bakes a total of 5 x 12 = 
<gadget id="calculator">5*12</gadget>
<output>60</output>
60 cookies.
Mr. Stone buys 2 x 12 = 
<gadget id="calculator">2*12</gadget>
<output>24</output>
24 cookies.
Brock buys 7 cookies, so Katy buys 2 x 7 = 
<gadget id="calculator">7*2</gadget>
<output>14</output>
14 cookies.
Meena sells a total of 24 + 7 + 14 = 
<gadget id="calculator">24+7+14</gadget>
<output>45</output>
45 cookies.
She has 60 - 45 = 
<gadget id="calculator">60-45</gadget>
<output>15</output>
15 cookies left.

<result>15</result>