Solutions by everydaycalculation.com
1st number: 1 12/30, 2nd number: 1 10/30
4230 - 4030 is 115.
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Related: 84/30-40/30 42/30-80/30 42/60-40/30 42/30-40/60 42/90-40/30 42/30-40/90
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