On day 2 Kim trades 6 earrings because 3 x 2 = <<6=6>>6
On day 3 Kim trades 5 earrings because 6 - 1 = <<6-1=5>>5
In total she trades 14 pairs of earrings because 3 + 6 + 5 = <<3+6+5=14>>14
She trades these for 126 gum-balls because 14 x 9 = <<14*9=126>>126
These last her 42 days because 126 / 3 = <<126/3=42>>42
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