20, What is double 10?, 18, What is double 9?, 60, What is double 30?, 100, Double 50 is .............., 22, Double 11 is ------------------, 14, Double 7 is _________, 24, What is double 12?, 80, What is double 40?, 30, Double 15 is ____________, 16, What is double 8 ?.

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