Edit MetaData
1 year, 12 months ago
1 year, 12 months ago
In 20 days the entire days would be completed,
Explanation: Let us assume total worked to be done is 100 units (LCM of 20 and 25), so A can complete 4 units per day and B can do 5 units per day.
They started together and worked for 4 days together hence work done by A and B is (4+5)*4=36 units and hence remaining job is 100-36=64 units now this will be done by A only since A can complete 4 units in a day, hence he can complete 64 units in 16 days.
Now question ask us about days in which entire work will be completed,which is equal to 16+4=20 day
1 year, 11 months ago
A's 1 day work- 1/25
B's 1 day work- 1/20
(A+B)'s 1 day work- 1/25 + 1/20 = 9/100
(A+B)'s 4 days work- 9/100 * 4= 36/100
Work left after 4 days- 1 - 36/100 = 64/100
B left, hence, A will complete the rest of the work in= 64/100 divided by 1/25 = 16 days
A will take another 16 days to complete the work.(Total days- 4+16= 20)
If the question is asking about how many more days A will take then answer is 16, whereas if it is talking about total days then answer is 20.
Quick, Easy and Effective Revision
By proceeding you agree to create your account
Free CAT Formulae PDF will be sent to your email address soon !!!