Practicing Success
A can do a piece of work in 20 days. B is 30% more efficient than A, and C is 50% more efficient than B. A and C work together for 3 days and then C leaves. A and B together will complete the remaining work in? |
4\(\frac{1}{13}\) 4\(\frac{38}{46}\) 4\(\frac{39}{46}\) 4.5 |
4\(\frac{39}{46}\) |
A : B : C 100 : 130 130 : 195 100 : 130 : 195 (divided 10) 10 : 13 : 19.5 A Total work = 10 × 20 = 200 Total work in 3 days by A + C → 3 (10+ 19.5) = 88.5 remaining work = 200 - 88.5 = 111.5 Now A + B taken days complete work = \(\frac{111.5}{10 + 13}\) = 4\(\frac{39}{46}\) |