A can do a certain work in 15 days. B is 25% more efficient than A. Both worked together for 4 days. C alone completed the remaining work in 8 days. A, B and C together will complete the same work in ?

• ক 9 days
• খ 5 days ✅ সঠিক উত্তর
• গ 7 days
• ঘ 8 days