A can do a piece of work in 15 days, B is 25% more efficient than A, and C is 40% 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:
Let efficiency of A be 100 ⇒ Efficiency of B = 100 + (100 × 25%) ⇒ Efficiency of B = 100 + 25 = 125 ⇒ Efficiency of C = 125 + (125 × 40%) ⇒ Efficiency of C = 125 + 50 = 175 ⇒ Ratio of efficiency of A ∶ B ∶ C = 100 ∶ 125 ∶ 175 ⇒ Ratio of efficiency of A ∶ B ∶ C = 4 ∶ 5 ∶ 7 A work for 15 days with efficiency 4unit ⇒ Total work done by A = 15 × 4 = 60 unit Now, (A + C) together work for 3 days. ⇒ Total efficiency of A and C together = 4 + 7 = 11 unit/day ⇒ Total work done by A and C together = 11 × 3 = 33 unit ⇒ Remaining work = Total work - Work done by A and C together ⇒ Remaining work = 60 - 33 ⇒ Remaining work = 27 unit ⇒ Total efficiency of A and B together = 4 + 5 = 9 unit/day ⇒ Required number of days = (27/9) = 3 days ⇒ Time required to complete remaining work = 3 days. ∴ Time required to complete remaining work is 3 days.
Present ages of P and Q are in the ratio 2:7 respectively. If Q’s age, 15 years hence from now will be 6 times of P’s age, 5 years ago from now, the...
A is 2 years older than B while C is 3 years younger than B. The ratio of age of A, 6 years hence and age of B, 5 years ago is 5:4. What was age of C, 1...
In a family a couple has a son and a daughter. The age of the father is four times that of his son and age of her daughter is half of her mother. The wi...
The ratio of age of A and his son is 5:1. If the difference of their ages 6 years ago is 24, then find the sum of the ages of A and his son together 11 ...
The ages of A, B and C together are 40 years. B is thrice as old as A and C is 5 years older than A. What is the difference between ages of B and C?
The ages of A, B and C together are 42 years. B is twice as old as A and C is 2 years older than A. What is the difference between ages of B and C?
Present ages of P and Q are in the ratio 3:5 respectively. If Q’s age, 16 years hence from now will be 6 times of P’s age, 6 years ago from now, the...
The ratio of age of ‘B’ after 6 years from now and age of ‘C’ 4 years ago from now is 7:4, respectively. The present age of ‘C’ is 40% of th...
B is 5 years older than A and A is 8 years older than C. If the sum of the age of A and C is 24 years, then find the sum of the ages of all three.
Five years ago, Bhuvan's age was half of Amisha's present age. If Bhuvan's current age is 20% less than Amisha's age, determine Amisha's present age.