Solutions by everydaycalculation.com

1520 + 3090 is 1312.

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

LCM of 20 and 90 is**180** - For the 1st fraction, since 20 × 9 = 180,

1520 = 15 × 920 × 9 = 135180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,

3090 = 30 × 290 × 2 = 60180 - Add the two fractions:

135180 + 60180 = 135 + 60180 = 195180 - 195/180 simplified gives 1312
- So, 15/20 + 30/90 = 13/12

In mixed form: 1112

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