mvictor wrote:
to be honest..I hate problems with VIC's...
we have w women and d days to complete the task
the rate is thus 1/d
the rate of each woman is 1/d : w or 1/dw
now, we have w+n women
the rate of all of them will be (w+n)/dw
now, how long will these women take to finish the job?
1: (w+n)/dw or dw/(w+n)
Why dont you make your life easy and plug in values for the variables. Then use the same pluggd in valued to analyse which of the options give you the same value.
Try w=10, d=5, n=15, n+w=25, giving you the number of days for 25 women = 2 days.
Analyse the options:
A: = 2 . KeepB: = 5. Eliminate.C: = 0.5 .Eliminate.D: = 0.2. Eliminate.E: = 12.5. Eliminate.Thus only A is left and is hence the correct answer.
You should use this approach when you are given a question full of variables and the answer choices are also in terms of those variables.
i tried to plug in values for 1 woman, and for days to complete 2. but then it got messy, and I just simply decided to go with the algebraic approach.