Subject
Quantitative Aptitude
Topic
Pipes & Cistern
A can do a work in 15 days and B in 20 days. If they on it together for 4 days, then the fraction of the work that is left is:
A can do a work in 15 days and B in 20 days. If they on it together for 4 days, then the fraction of the work that is left is:
ক)
1/4খ)
1/8গ)
1/15ঘ)
8/15Explanation
Solution: (A+B)'s 1 day's work = 1/15 + 1/20 = (4+3)/60 = 7/60 part. So, (A+B)'s 4 day's work = 7/60 4 or 7/15 part. So, Work left 1- 7/15 = 8/15 part.Related questions
An empty bucket being filled with paint at a constant rate takes 6 min to be filled 7/10 of its capacity. Howmuch moretime will it take to fill the bucket to full capacity.A water tank is two-fifth full. Pipe A can fill the tank in 10 minutes and pipe B can empty it in 6 minutes. If both pipes are opened, how long will it take to empty or fill the tank completely ?A container full of water weighs 20 kg. If one-fourth of the container is full of water, it weighs 8 kg. What is the weight of the empty container ?