A completed \(\frac{7}{{10}} \)of work in 15 days, then he completed the remaining work with the help of B in 4 days. In how many days A and B can complete the entire work together?
\(10\frac{1}{2}{ \text{days}}\)
\(12\frac{2}{3}{ \text{days}}\)
\(13\frac{1}{3}{ \text{days}}\)
\(8\frac{1}{4}{ \text{days}}\)
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