Time and Work Tricks for Bank Po
Time and Work Tricks for Bank Po
Time and Work Tricks for Bank Po exam
If a man A can do a piece of work in m days
Then the piece of work done by A in 1 day = 1/m
Now suppose A can do a piece of work in x days
B can do the same work in y days
1 day work of A = 1/x
1 day work of B =1/y
1 day work of A and B = 1/x + 1/y
= (y + x) / xy
A and B can do the work in xy/ (x + y) days
And C can do a work in z days
Then 1 day work of A = 1/x
1 day work of B = 1/y
1 day work of C = 1/z
1 day work of A, B and C together = 1/x + 1/y + 1/z
= (yz + zx + xy)/ xyz
Then A, B and C can finish the work together in xyz/ (xy + yz + zx) days
Time and work Tricks for Bank Exam
Total work done = number of persons number of days
Suppose M1persons can do a work in D1days and M2persons can do the same work in D2days
Then total work done by M1persons = M1D1
Total work done by M2persons = M2D2
But the work done by both group of persons is same
M1D1 = M2D2
Question on SSC CGL exam
Suppose M1 persons can do W1 works in D1 days and M2 persons can do W2 works in D2 days
Then M1.D1. W2 = M2. D2 .W1
Efficiency
If A can do a work in x days and B can do a work in y days
Then 1 day of work = 1/x
1 day work of B = 1/y
Ratio of efficiency = 1/x : 1/y
= y : x
Ratio of efficiency of A and B = Y : X
Top Bank Coaching in Lucknow
Suppose A builds a building in x days
B builds the same building in y days
And C breaks the same building in z days
1 day work of A = 1/x
1 day work of B = 1/y
1 day work of C = – 1/z ( this is negative because C breaks the building i.e. C works negative for us)
1 day work of all together = 1/x + 1/y – 1/z
= (yz + zx – xy) / xyz
A,B and C will finish the work in xyz / (yz + zx – xy) days
Some important ticks
Time and work Tricks for Bank Exam
1. If A and B together can do a work in x days, B and C together can do it in y days and C and A can do the same work in z days, then in how many days can A, B and C together complete the work ?
No. of days = 2xyz/xy+yz+zx
2. If A, B and C together complete a work in x days, while any two of them complete the work in y and z days respectively, then in how many days the third complete the work ?
= xyz/yz-x(y + z)
3. If A and B together can do a work in x days, B and C together can do it in y days and C and A can do the same work in z days, then in how many days can A, B and C alone complete the work ?
A = 2xyz/xy+yz-zx
B = 2xyz/-xy+yz+zx
C = 2xyz/xy-yz+zx
4. A can do complete a work in x days, but after y days A leave and remaining work completed by B in z days. In how many days can B alone do the complete work ?
= (xz/x-y)
5. If A is n times efficient as B and both together complete a work in x days, then A and B alone complete the work in
A= (n+1/n) × days
B= (n+1) × days
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