Question
Pipe ‘A’ can fill a tank in 25 hours while pipe
‘B’ takes 30 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 13 hours pipe ‘B’ is also opened. In how much time will the tank get filled completely?Solution
Let the total capacity of the tank be 150 units Efficiency of pipe ‘A’ = 150/25 = 6 units/hour Efficiency of pipe ‘B’ = 150/30 = 5 units/hour Tank filled in 13 hours = 13 × 6 = 78 units Therefore, required time taken to fill the remaining tank = (150 – 78)/(6 – 5) = 72 hours Therefore, total time taken = 13 + 72 = 85 hours
The marks obtained by A is 25% more than B, and the marks obtained by C is 140 more than the difference of the marks obtained by A and B. If C obtained ...
- A number is first increased by 10% and then decreased by 10%. The overall change in number is:
A teacher distributes 300 toffees among her 4 students, A, B, C and D. A gets x% of total toffees, B receives 2x% of the remaining toffees, C receives (...
If 45% of a number is 90, what is 60% of the same number?
In a test comprising 200 questions, four marks are awarded for every question answered correctly. The number of marks deducted for every question answer...
- A farmer harvested 8000 kg of produce, where 40% of the produce was fruits and the remaining was vegetables. If 60% of the fruits harvested and 50% of the ...
In a school, 60% of the students pass and 30 fail. The number of students appearing from another school is 25 more and 20 more students pass than the f...
If a company decreases its number of workers by 50% and increases the remaining employees' salaries by 50%, resulting in a decrease of Rs. 25,000 in tot...
A businessman's earning increase by 25%in one year but decreases by 4%in the next. Going by this pattern, after 5 years, his total earnings would be Rs....
- Initially, Rina’s salary was Rs. 40,000 and the ratio of her expenditure to her savings was 3:5. After a salary increase, she reduced her expenditure by ...
