If 15 pumps of equal capacity can fill a tank in 7 days, then how many extra pumps will be required to fill the tank in 5 days?
Reviewed by Dalvoy
UPSC Civil Services preparation
- A6Correct
- B7
- C14
- D21
Explanation
To solve this, we use the principle that the total work remains constant. Total work can be calculated as the number of pumps multiplied by the number of days.
Initial total work is 15 pumps multiplied by 7 days which equals 105 pump days.
To complete the same work in 5 days, we divide the total work by the number of days. So, 105 divided by 5 equals 21 pumps.
The question asks for the number of extra pumps required. Since we already have 15 pumps, we subtract 15 from 21.
21 minus 15 equals 6.
Therefore, 6 extra pumps are required. The correct option is A.
Related questions
More UPSC Prelims practice from the same subject and topic.
- Prelims 1998GS1economy
A consumer is said to be in equilibrium, if
- Prelims 1998GS1economy
The supply-side economics lays greater emphasis on the point of view of
- Prelims 1998GS1economy
Match List I with List II and select the correct answer using the codes given below the lists: List I List II I. Ringgit A) Indonesia II. Baht B) South Korea III. Rupiah C) Thailand IV. Won D) Malayas…
- Prelims 1998GS1economy
Human Poverty Index was introduced in the Human Development Report of the year
- Prelims 1998GS1economy
Which of the following pairs are correctly matched? I. Dow Jones: New York II. Hang Seng: Seoul III. FTSE - 100: London Select the correct answer using the codes given below:
- Prelims 1998GS1economy
According to the World Development Report, low-income economies are those for which the per capita GNP in 1994 was