plz help

[anuragsodhi]

3)
if 7 dancers dance for 8 hours and lose 20 pounds
1 dancer for 8 hours lose 20/7 pounds
1 dancer for 1 hour lose 20/(8*7) pounds

let the new dancers be x
to make her a dancer at par with others (lol in this case to lose weight) we have to devide it by 2

nw time is hours

continuing the above equation..

1 dancer for 4 hours lose [20/(7*8)]*4 pounds
total dancers now... (7+x/2) because lets say x=4 so effectively they are doing same work as the original 2 dancers would do..

(7+x/2) for 4 hours lose [20/(7*8)]*4*(7+x/2)

now the total weight lost is 20 so..

[20/(7*8)]*4*(7+x/2)=20

so effectively

4*(7+x/2) = 8*7

so x=14

interestingly, the above equation can easily be thought of .. wid practice and understanding..


best of luck

[Johnbear]

they are more relevant to quantitative section of general test, rather than subject. Here is this sub-forum: