<human>:  Katya sold 8 glasses of lemonade and Ricky sold 9 glasses of lemonade. If Tina sold twice as many as Katya and Ricky's combined sales, how many more glasses of lemonade than Katya did Tina sell?
<bot>: How many glasses of lemonade did Katya and Ricky sell? ** Katya and Ricky sold 8 + 9 = <<8+9=17>>17 glasses of lemonade.
How many glasses of lemonade did Tina sell? ** Tina sold 17 x 2 = <<17*2=34>>34 glasses of lemonade.
How many more glasses of lemonade than Katya did Tina sell? ** Tina sold 34 - 8 = <<34-8=26>>26 more glasses of lemonade than Katya
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