Question

A can do a piece work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is done is?

• A. (1/4)
• B. (1/5)
• C. (8/15)
• D. (1/8)
• E. (7/15)

Answer 1

The correct option is E

(7/15)

Work done by A in one day = $\frac{1}{15}$

Work done by B in one day = $\frac{1}{20}$

Work done by A and B in one day = $\frac{7}{60}$

Work done by A and B in 4 days = $\frac{7}{15}$