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2Â years, 5Â months ago
2Â years, 5Â 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
2Â years, 5Â 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.
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