Question
Pipe ‘A’ can fill a tank in 30 hours while pipe
‘B’ can empty it in 40 hours. They were operated on alternate hours starting with pipe ‘A’. Find the percentage of tank filled this way in 54 hours.Solution
Let the total capacity of tank be 120 units Efficiency of pipe ‘A’ = 120/30 = 4 units/hour Efficiency of pipe ‘B’ = 120/40 = 3 units/hour Tank filled in 2 hours = (4 – 3) = 1 units Therefore, tank filled in (2 × 27 = 54 hours) = 1 × 27 = 27 units Required percentage of tank filled = (27/120) × 100 = 22.5%
Five years ago from now, ratio of ages of Neha and Reema was 3:7, respectively. If 5 years hence from now, ratio of their ages will be 5:9, then find th...
- The current age ratio of 'P' and 'Q' is 4:7 respectively. The ratio of the age of 'P' six years from now and the age of 'Q' six years ago is 5:6 respective...
The average age of three partners - Neil, Olivia, and Pete - in a startup is 32 years. The ratio of Pete's to Quinn's current ages is 2:3, and Olivia's ...
The ratio of the present age of A to that of B is 7:9. Six years ago the ratio of 1/3 of A’s age at that time and 1/3 of B’s age at that time was 1:...
At the moment, Anuj and Bishnu have ages in the ratio of 3:4, respectively. If Bishnu's current age were 20% higher, the age gap between Anuj and Bishnu...
After 7 years, the age of Reena will be 5 years less than 3 times of her age, 4 years back. What is Reena’s present age?
At the time of 'Binny's birth, the age of 'Ankush' was twice the present age of 'Binny'. Fourteen years from now, if the ratio of their ages is 25:13, f...
Sum of the present ages of A, B, C and D is 70 years. After 5 years ratio of their ages is 5:4:3:3. What is C’s present age?
In a group of 10 members, two individuals are 20 and 30 years old. Excluding these two, the average age of the remaining members increases by 1 year. De...
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...
Relevant for Exams:
