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10/15 + 3/15 = 13/15 13/15
2/3 + 1/5 = 10/15 + 3/15 = 13/15
1/5 = 3/15 2/3 = 10/15 3/15 + 10/15 = 13/15
2/3+1/5=10/15+3/15=(10+3)/15=13/15
It is: 13/30