Seth gave half of his stickers to Luis. Luis used half of the stickers and gave the rest to Kris.  Kris kept 9 of the stickers and gave the remaining 7 stickers to Rob. How many stickers did Seth have in the beginning?
Luis gave 9 + 7 = 
<gadget id="calculator">9+7</gadget>
<output>16</output>
16 stickers to Kris.
Luis gave half of his stickers to Kris which means that he had 16 x 2 = 
<gadget id="calculator">16*2</gadget>
<output>32</output>
32 stickers.
Seth had 32 x 2 = 
<gadget id="calculator">32*2</gadget>
<output>64</output>
64 stickers.

<result>64</result>