RRB JE Maths Important Solved MCQs

A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in:

A.

1

day

24

B.

7

day

24

C.

3

3

days

7

D.

4 days

Answer: Option C

 

 

Formula: If A can do a piece of work in n days, then A's 1 day's work =

1

.

n

 

(A + B + C)'s 1 day's work =

https://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif

1

+

1

+

1

https://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif

=

7

.

24

6

12

24

 

Formula: If A's 1 day's work =

1

,

then A can finish the work in n days.

n

 

So, all the three together will complete the job in

https://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif

24

https://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif days

=

3

3

days.

7

7