Sum of three fractions

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\(\frac{1}{8}+\frac{1}{2}+\frac{1}{5}=?\)
\(\frac{9}{40}\)
\(\frac{7}{40}\)
\(\frac{13}{40}\)
\(\frac{23}{40}\)
\(\frac{33}{40}\)

Calculator
Hint \(\frac{1}{8}+\frac{1}{2}+\frac{1}{5}\)
\(=\frac{1\times{5}}{8\times{5}}+\frac{1\times{20}}{2\times{20}}+\frac{1\times{8}}{5\times{8}}\)
\(=\frac{5}{40}+\frac{20}{40}+\frac{8}{40}\)
\(=\frac{5+20+8}{40}\)
\(=\frac{33}{40}\)
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