RRB JE Maths Important Solved MCQs


If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same​​ in 2 days, the time taken by 15 men and 20 boys in doing the same type of work will be:

A.

4 days

B.

5 days

C.

6 days

D.

7 days

Correct Answer: Option A

 

Let 1 man's 1 day's work = x and 1​​ boy's 1 day's work = y.

Then, 6x + 8y =

1

and 26x + 48y =

1

.

10

2

 

Solving these two equations, we get : x =

1

and y =

1

.

100

200

 

(15 men + 20 boy)'s 1 day's work =

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

15

+

20

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

=

1

.

100

200

4

https://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif 15 men and 20 boys can do the work in 4 days.