Solutions by everydaycalculation.com

1^{st} number: 3 12/20, 2^{nd} number: 6/21

7220 + 621 is 13635.

- Find the least common denominator or LCM of the two denominators:

LCM of 20 and 21 is**420** - For the 1st fraction, since 20 × 21 = 420,

7220 = 72 × 2120 × 21 = 1512420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,

621 = 6 × 2021 × 20 = 120420 - Add the two fractions:

1512420 + 120420 = 1512 + 120420 = 1632420 - 1632/420 simplified gives 13635
- So, 72/20 + 6/21 = 136/35

In mixed form: 33135

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