5 men and 4 boys can do a piece of work in 15 days while 4 men and 3 boys can do the same work in 15 days. In how many days can 2 men and 1 boy do the work?

Options
- 12 days
- 14 days
- 18 days
- None

CORRECT ANSWER : None

Discussion Board
Maths

5m+4b=1/15....1
4m+3b=1/15....2

Multiply equation 1by4 and 2by5....and then subtract 3&4 that equations......we get
20m+16b=4/5......3
20m+15b=1/3.......4
- - -
b=-1/15
Now,equating the value of b in eq4, we get
20m+15(-1/15)=1/3
m=1/15

Now,2m+b=
2(1/15)-1/15=1/15
=15 days
Ans:None



Smit shah 03-20-2021 07:15 AM

Wrong question

5M+4B = 15d, then if we decrease both men and boys, then days also has to be increased but here it''s same. How?

4M+3B=15d

Rajarajan 12-19-2020 01:09 AM

Electrician

Nice

Manish 03-3-2019 07:48 AM

solution

5m + 4b = 1/15 ---a
4m + 3b = 1/15 ---b
(4*b)-(3*a)
5m=1/15
m=1/75
a---- 4b=0
b=0
2m + 1b = 2*1/75 = 37.5 days

b2 09-20-2018 07:55 AM

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