Question Detail

A can do a certain job in 25 days which B alone can do in 20 days. A started the work and was joined by B after 10 days. The number of days taken in completing the wotk were ?

$\begin{aligned} 14\frac{2}{3}kmph \end{aligned}$
$\begin{aligned} 15\frac{2}{3}kmph \end{aligned}$
$\begin{aligned} 16\frac{2}{3}kmph \end{aligned}$
$\begin{aligned} 17\frac{2}{3}kmph \end{aligned}$

Answer: Option C

Explanation:

Work done by A in l0 days = (1/25) *10 = 2/5
Remaining work = 1 - (2/5) = 3/5
(A+B)s 1 days work = (1/25) + (1/20) = 9/100

9/100 work is done by them in 1 day.
hence 3/5 work will be done by them in (3/5)*(100/9)
= 20/3days.

Total time taken = (10 + 20/3) = 16*(2/3) days

1. A does half as much work as B in three-fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it

40 days
35 days
30 days
25 days

Answer: Option C

Explanation:

Suppose B takes x dáys to do the work.
As per question A will take

$\begin{aligned} 2* \frac{3}{4} * x = \frac{3x}{2}days \end{aligned}$

(A+B)s 1 days work= 1/18
1/x + 2/3x = 1/18 or x = 30 days

2. A can finish a work in 18 days and B can do same work in half the time taken by A. then working together, what part of same work they can finish in a day

Answer: Option B

Explanation:

Please note in this question, we need to answer part of work for a day rather than complete work. It was worth mentioning here because many do mistake at this point in hurry to solve the question

So lets solve now,
A's 1 day work = 1/18
B's 1 day work = 1/9 [because B take half time than A]

(A+B)'s one day work =

$\begin{aligned} \left(\frac{1}{18}+\frac{1}{9} \right) \\ =\left(\frac{1+2}{18} \right) \\ = \frac{1}{6} \end{aligned}$

So in one day 1/6 work will be done.

3. 10 women can complete a work in 7 days and 10 children take 14 days to complete the work. How many days will 5 women and 10 children take to complete the work?

6 days
7 days
8 days
9 days

Answer: Option B

Explanation:

1 woman's 1 day's work = 1/70
1 Child's 1 day's work = 1/140
5 Women and 10 children 1 day work =

$\begin{aligned} \left(\frac{5}{70}+\frac{10}{140}\right) \\ = \frac{1}{7} \end{aligned}$

So 5 women and 10 children will finish the work in 7 days.

4. A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

4 days
5 days
6 days
7 days

Answer: Option C

Explanation:

(A+B)'s 1 day work = 1/4

A's 1 day work = 1/12

B's 1 day work =

$\begin{aligned} \left( \frac{1}{4} - \frac{1}{12} \right) \\ = \frac{3-1}{12} \\ = \frac{1}{6} \\ \end{aligned}$

So B alone can complete the work in 6 days

5. 5 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio

Answer: Option C

Explanation:

Let 1 man 1 day work = x
1 boy 1 day work = y

then 5x + 2y = 4(x+y)
=> x = 2y
=> x/y = 2/1
=> x:y = 2:1

rahul khowal 8 years ago

can you give me some questions to SSC

Question Detail

A can do a certain job in 25 days which B alone can do in 20 days. A started the work and was joined by B after 10 days. The number of days taken in completing the wotk were ?

1. A does half as much work as B in three-fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it

2. A can finish a work in 18 days and B can do same work in half the time taken by A. then working together, what part of same work they can finish in a day

3. 10 women can complete a work in 7 days and 10 children take 14 days to complete the work. How many days will 5 women and 10 children take to complete the work?

4. A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

5. 5 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio

Thanks ! Your comment will be approved shortly !

rahul khowal 8 years ago

Videos @mastguru

To Appreciate Our Effort, Please Like Us

Quantitative Aptitude

English Aptitude

Reasoning Aptitude

Computer Awareness

General Knowledge

Current Affairs

IT Officer Aptitude

Programming Aptitude

Latest Govt Jobs

Question Detail

A can do a certain job in 25 days which B alone can do in 20 days. A started the work and was joined by B after 10 days. The number of days taken in completing the wotk were ?

1. A does half as much work as B in three-fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it

2. A can finish a work in 18 days and B can do same work in half the time taken by A. then working together, what part of same work they can finish in a day

3. 10 women can complete a work in 7 days and 10 children take 14 days to complete the work. How many days will 5 women and 10 children take to complete the work?

4. A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

5. 5 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio

Thanks ! Your comment will be approved shortly !

rahul khowal 8 years ago

Videos @mastguru

To Appreciate Our Effort, Please Like Us

Current Affairs

Govt Jobs

Current Affairs 15th August 2019

Current Affairs 14th August 2019

Current Affairs 13th August 2019

Current Affairs 12th August 2019

Current Affairs 11th August 2019

Junior Associates (Clerical Cadre) Jobs in SBI

Technical Jobs in NGRI

Experienced Personnel Jobs in Power Grid NRTS-I

The Punjab State Transmission Corporation Limited (PSTCL) Jobs

Energy Assistant Jobs in AP CPDCL