Solutions by everydaycalculation.com

15 + 620 is 12.

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

LCM of 5 and 20 is**20** - For the 1st fraction, since 5 × 4 = 20,

15 = 1 × 45 × 4 = 420 - Likewise, for the 2nd fraction, since 20 × 1 = 20,

620 = 6 × 120 × 1 = 620 - Add the two fractions:

420 + 620 = 4 + 620 = 1020 - After reducing the fraction, the answer is 12

Related: ^{2}/_{5}+^{6}/_{20} ^{1}/_{5}+^{12}/_{20} ^{1}/_{10}+^{6}/_{20} ^{1}/_{5}+^{6}/_{40} ^{3}/_{5}+^{6}/_{20} ^{1}/_{5}+^{18}/_{20} ^{1}/_{15}+^{6}/_{20} ^{1}/_{5}+^{6}/_{60} ^{1}/_{5}+^{30}/_{20} ^{1}/_{25}+^{6}/_{20} ^{7}/_{5}+^{6}/_{20} ^{1}/_{5}+^{42}/_{20} ^{1}/_{35}+^{6}/_{20}

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