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
M_{1 }persons can do W_{1} work in D_{1} days and M_{2}
persons can do W_{2} work in D_{2} days, then
9. If
M_{1 }persons can do W_{1} work in D_{1} days for h_{1}
hours and M_{2} persons can do W_{2} work in D_{2} days
for h_{2} 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