1.

A complete $$\frac{7}{{10}}$$ of a work in 15 days, then he completed the remaining work with the help of B in 4 days. In how many day A and B can complete entire work together?

A. $10\frac{1}{2}\,\,{\text{days}}$$
B. $12\frac{2}{3}\,\,{\text{days}}$$
C. $13\frac{1}{3}\,\,{\text{days}}$$
D. $8\frac{1}{4}\,\,{\text{days}}$$
Answer» D. $8\frac{1}{4}\,\,{\text{days}}$$


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