2 men and 7 boys can do a piece of work in 14days 3 men and 8 boys can do

Ans is : 21 days
7 days
.
.
2A + 7B = 1 / 14
3A + 8B = 1 / 11
.
A = 1 / 77
B = 1 / 154
.
.
this gives 7 days
three times the amount of this work is=7*3=21 days...
9 years agoHelpfull: Yes(12) No(0)
2m+7b=1/14
3m+8b=1/11
by solving those we get m=1/77 and b=1/154
according to our problem
((8*1/77)+(6*1/154))*x=3
by solving we get
x=21 days.
9 years agoHelpfull: Yes(7) No(0)
7 days
.
.
2A + 7B = 1 / 14
3A + 8B = 1 / 11
.
A = 1 / 77
B = 1 / 154
.
.
this gives 7 days
9 years agoHelpfull: Yes(6) No(5)
38 1/2 days
9 years agoHelpfull: Yes(1) No(1)
21 days...is answer
9 years agoHelpfull: Yes(1) No(0)
14*(2m+7b)=11*(3m+8m)
28m+98b=33m+88b
98b-88b=33m-28m
10m=5m
1men=2boys
3men+8boys=(3*2boys+8boys)
14boys
so,
8m+6b=22boys
14 boys-------------------11days
1boys 14*11
22 boys (14*11)/22
x=7days
8men and 6 boys do three times of work in 21 days...
8 years agoHelpfull: Yes(1) No(0)
i think 28 days
9 years agoHelpfull: Yes(0) No(4)
16.5 it is
9 years agoHelpfull: Yes(0) No(2)
ans 7days;
efficiency of man =77 & for boy =154;
9 years agoHelpfull: Yes(0) No(1)
9 people do in 14 days
11 people do in 11 days
so,when we increase two people then three days decrease
14 people will do in 6 and 1/2 days (bcoz here 5 people increase so 7 and half days will decrease)
7 years agoHelpfull: Yes(0) No(2)

2 men and 7 boys can do a piece of work in 14days. 3 men and 8 boys can do the same in 11 days. Then 8 men and 6 boys can do three times the amount of this work in????