Time And Work questions formula for placement
1.
Work
from Days:
If
A can do a piece of work in n days, then A's 1 day's work =
|
1
|
.
|
n
|
2.
Days
from Work:
If
A's 1 day's work =
|
1
|
,
|
then
A can finish the work in n days.
|
n
|
3.
Ratio:
If
A is thrice as good a workman as B, then:
Ratio
of work done by A and B = 3 : 1.
Ratio
of times taken by A and B to finish a work = 1 : 3.
4. No. of days = total work / work done
in 1 day
5. Relationship
between Men and Work
More men ------- can
do -------> More work
Less men ------- can
do -------> Less work
6. Relationship
between Work and Time
More work -------- takes------>
More Time
Less work -------- takes------>
Less Time
7. Relationship
between Men and Time
More men ------- can
do in -------> Less Time
Less men ------- can
do in -------> More Time
8. If
M1 persons can do W1 work in D1 days and M2
persons can do W2 work in D2 days, then
9. If
M1 persons can do W1 work in D1 days for h1
hours and M2 persons can do W2 work in D2 days
for h2 hours, then
Note: If
works are same, then M1D1h1 = M2D2h2
10. If
A can do a work in ‘x’ days and B can do the same work in ‘y’ days, then the
number of days required to complete the work if A and B work together is
11. If
A can do a work in ‘x’ days and A + B can do the same work in ‘y’ days, then
the number of days required to complete the work if B works alone is
