If 4 men or 7 boys can do a work in 29 days then 12 men and 8 boys will do the same work in:
[A].
29
[B].
17
[C].
7
[D].
21
[E].
30
Answer: Option C
Explanation:
Solve the question using only boys. The ration 7/29 = x/21+8. The second ration is reverse as the relation between men (or boys) is inverse. If 4 men work equivalent to 7 boys so 12 men are equivalent to 21 boys.
4 men or 7 boys can do a work in 29 days means
4 men=7 boys
=> 12 men=21 boys
also here is and or making confusion
in or we take ratio direct and in and we take its inverse
so ratio becomes
7:29::x:21+8 (since 12 men=21 boys here 12 men is replaced by 21 boys)
solve this to get x=7 answer
u got it Saba?
Nadeem said:
AOA. Sir I think, the ratio is inverse because with increase in number of boys, there will be decrease in number of days to do a particular job. Thats why, the ratio has been taken inverse.
Iqra Sharif said:
Sir! In 2nd condition boys are 8 but you say boys are 21 how??????
