Solutions by everydaycalculation.com
1st number: 16/20, 2nd number: 1 4/20
1620 - 2420 is -25.
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Related: 32/20-24/20 16/20-48/20 16/40-24/20 16/20-24/40 48/20-24/20 16/20-72/20 16/60-24/20 16/20-24/60 80/20-24/20
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