Question: Find the answer to the math problem: 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?
Answer: 
Luis gave 9 + 7 = 16 stickers to Kris.
Luis gave half of his stickers to Kris which means that he had 16 x 2 = 32 stickers.
Seth had 32 x 2 = 64 stickers.