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By adding similar fractions...Just simply add the corresponding numerator to the other numerator.

For\ example; \\  \frac{1}{10}+\frac{2}{10}+\frac{3}{10}= \frac{6}{10}\ or\ \frac{3}{5}  \\ \\  \frac{5}{20} +\frac{7}{20}+\frac{7}{20}= \frac{19}{20}  \\ \\  \frac{4}{15}+\frac{4}{15}+\frac{5}{15}= \frac{13}{15}

As,simple as that...

Hope it Helps:)