Basics:
1.
If A can do a piece of work in n days then A’s 1
day’s work=1/n.
2.
If A’s 1 day’s work=1/n, then A can finish the work
in n days.
3.
If A is twice as good a workman as B, then
Ratio of work done by A and B = 2 : 1.
Ratio of times taken by A and B to finish a work= 1
: 2.
4.
If A can do a piece of work in x days and B can do
it in y days then A and B working together will do the same work in xy/x+y
days.
5.
If M1 persons can do W1 work in D1 days by working
H1 hours and M2 persons can do W2 work in D2 days by working H2 hours then we
have a very general formula in the relationship of
M1D1H1/W1=M2D2H2/W2.
1.
A can do a piece of work in 10
days B in 15 days in how many days they together can complete
that work.
2.
A can do a piece of work in 10
days B in 20 days C in 30 days in how many days A,B and C
can complete that work working together.
3.
A and B together can do a piece of work in
20 days. A alone can
do that work in 30 days in how many days B alone can complete
that work.
4.
A and B can do a piece of work in 12days B
and C in 15days C and A in 20 days in how many days all of
them can complete working together.
5.
A can do a job in 5 days B in 4 days and A, B and C
together in 2 days in what time C can do it alone.
6.
A can do a piece of work in 10
days B in 15 days. A started the work and worked for 4 days then
A left B alone can complete the remaining work in how many days.
7.
A can do a piece of work in 10
days B in 15 days they together worked for 4 days and then B left in how
many days A alone can complete the remaining work.
8.
A can do a piece of work in 10
days B in 15 days. A worked for 4 days and then B is joined. In how many
days they together can complete the remaining work.
9.
X and Y can do a piece of work in 30
days and 40 days respectively they began the work together but
Y left after some days X complete the remaining work in 9 days. after how many
days did Y leave.
10.
A and B can do a piece of work in 15 days
and 20 days respectively. In how many days they complete the work if
they are working on alternate days started by A.
11.
A is 40% more efficient then Band
he can complete a piece of work in 20days in how many days
B alone can complete that work.
12.
X is thrice as efficient as Y and they together can
complete that work in 12 days.In
how many
days Y alone can complete that work.
13. A can do a piece of work in 10 days B in 15
days they under to do a piece of work for Rs. 250. Find the wage of A if they
completed the work together.
14. A and B
can finish a work in 10 days and 15 days respectively. They worked together for
two days and A left the remaining work was completed by B. If they together
earned Rs.250 what is the share of
15. 12 men can
do a piece of work in 20days 15 men can complete that work in how many days.
16. A certain
no.of men complete a piece of work in 60 days. If there were 8 more men the
work could be finished in 10 days less. How many men were there originally.
17. 20 men
complete a work in 30 days. When should 5 men leave so that it may be completed
in 35 days.
18. 10 men or
12 women can do a piece of work in 44 days. In how many days 5 men and 6 women
can complete that work.
19. A is 50%
as efficient as B. C does half of the work done by A and B together. IfC alone
does the work in 40 days, then A, B and C together can do the work in
20. If 4 men
and 3 women can do a piece of work in 8 days 6 men and 9 women can do it in 4
days. In how many days 20 men and 6 women do the same work.
Answers
|
|
1
|
6
|
2
|
5 5/11
|
3
|
60
|
4
|
10
|
5
|
20
|
6
|
9
|
7
|
3 1/3
|
8
|
3 3/5
|
9
|
12
|
10
|
17
|
11
|
28
|
12
|
48
|
13
|
150
|
14
|
50
|
15
|
16
|
16
|
40
|
17
|
15
|
18
|
44
|
19
|
13 1/3
|
20
|
2
|
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