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Re: If 12 men and 16 women can do a piece of work in 5 days and 13 men and [#permalink]
adewale223 wrote:
Alternatively

Let rate of one man be x and that of one woman be y


12x + 16y = 1/5...........1

13x + 24y = 1/4.............2


y = 1/200, x = 1/100

Let days required for 7 men and 10 women do job be d

0.12 = 1/d

d = 8.3333

Answer C

Adewale Fasipe, quant instructor from Lagos Nigeria.


In the 2 equations, I tool RHS as 5 and 4 instead of 1/5 and 1/4, and ended up getting y<0.
But I'm not sure why did I do that? adewale223, could you pls help.
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Re: If 12 men and 16 women can do a piece of work in 5 days and 13 men and [#permalink]
1
Jeeth15 wrote:
adewale223 wrote:
Alternatively

Let rate of one man be x and that of one woman be y


12x + 16y = 1/5...........1

13x + 24y = 1/4.............2


y = 1/200, x = 1/100

Let days required for 7 men and 10 women do job be d

0.12 = 1/d

d = 8.3333

Answer C

Adewale Fasipe, quant instructor from Lagos Nigeria.


In the 2 equations, I tool RHS as 5 and 4 instead of 1/5 and 1/4, and ended up getting y<0.
But I'm not sure why did I do that? adewale223, could you pls help.




If you take take the sums as 5 and 4 in the two equations, they wont correspond because the sums represent rate, so what they equals to has to be rate as well.
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Re: If 12 men and 16 women can do a piece of work in 5 days and 13 men and [#permalink]
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