Neil baked 20 cookies. He gave 2/5 of the cookies to his friend. How many cookies are left for Neil?
Neil gave 20 x 2/5 = 
<gadget id="calculator">20*2/5</gadget>
<output>8</output>
8 cookies.
So he is left with 20 - 8 = 
<gadget id="calculator">20-8</gadget>
<output>12</output>
12 cookies.

<result>12</result>