Sandra had 2 bags that each contained 6 pieces of candy so 2*6 = <<2*6=12>>12 pieces
Roger had 11 pieces of candy in one bag and 3 pieces in the other so 11+3 = <<11+3=14>>14 pieces
Roger had 14 pieces and Sandra had 12 pieces so Roger has 14-12 = <<14-12=2>>2 more pieces of candy
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