To do a certain work, the ratio of efficiencies of A and B is 13 : 11. Working together, they can complete the same work in 19\(\frac{1}{2}\) days. A alone will complete 75% of the same work in?
Answer & explanation
Correct answer: option 2
A : B
13 : 11
Total work = \(\frac{39}{2}\) × 24 = 468
A completed 75% work in = 468 × \(\frac{75}{100}\) × \(\frac{1}{13}\)
= 27 days