Solutions by everydaycalculation.com
1st number: 1 6/10, 2nd number: 4/10
1610 + 410 is 21.
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Related: 32/10+4/10 16/10+8/10 16/20+4/10 16/10+4/20 48/10+4/10 16/10+12/10 16/30+4/10 16/10+4/30 80/10+4/10 16/10+20/10 16/50+4/10 16/10+4/50 16/10+28/10 16/70+4/10 16/10+4/70
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