SELECTION TEST
-5.
If A can do a job in 20 days and B can do a job in 5 days, how many days it will take for them to complete the job, if they do it together?
0 1 day
O 2 days
3 days
4 days
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they will take 4 days .
answer- 4 days
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Answer:
If A can do a job in 20 days and B can do a job in 5 days, how many days it will take for them to complete the job, if they do it together?
A. 1 day
B.2 days
C.3 days
D.4 days
Step-by-step explanation:
- According to given question we are given with the information-
- Time taken by A to complete the work is 20 days,
- Time taken by B to complete the work is 5 days.
- We have to find out how much time they will take in all if they work together. We are also given four options that are- 1 day, 2 day, 3 day and 4 day.
- Work done by A in 1 day is 1/20,
- And work done by B in 1 day is 1/5.
- That is, together work done is- (A+B)= 1/5+ 1/20= 5/20=1/4
- Both A and B will complete the work in 4 days
- But they worked for 3 days only that is 3x 5/20= 15/20
- That is 1/4.
- This was simple method to find out how many days they both will required if work together.
- So in all 4days which is option number D is correct.
Hence A and B will required 4 days if they work together.
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