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If 12 boys and 16 girls can do a work in 5 days and 13 boys

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Director
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If 12 boys and 16 girls can do a work in 5 days and 13 boys [#permalink]

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New post 04 Nov 2005, 11:13
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If 12 boys and 16 girls can do a work in 5 days and 13 boys and 24 girls can do it in 4 days,
1) Days required for 7 boys and 10 girls to complete the work.
2) Time required by you to answer this 'work' problem.

Answer choices for (1)
(A) 8.11
(B) 8.33
(C) 9.11
(D) 9.33
(E) None of the above

Your 2 mins starts now....
SVP
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Re: Warm up with work! PS [#permalink]

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New post 04 Nov 2005, 11:27
gsr wrote:
If 12 boys and 16 girls can do a work in 5 days and 13 boys and 24 girls can do it in 4 days,
1) Days required for 7 boys and 10 girls to complete the work.
2) Time required by you to answer this 'work' problem.

Answer choices for (1)
(A) 8.11
(B) 8.33
(C) 9.11
(D) 9.33
(E) None of the above

Your 2 mins starts now....

B it is :wink:
SVP
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Re: Warm up with work! PS [#permalink]

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New post 04 Nov 2005, 11:32
gsr wrote:
If 12 boys and 16 girls can do a work in 5 days and 13 boys and 24 girls can do it in 4 days,
1) Days required for 7 boys and 10 girls to complete the work.
2) Time required by you to answer this 'work' problem.

Answer choices for (1)
(A) 8.11
(B) 8.33
(C) 9.11
(D) 9.33
(E) None of the above

Your 2 mins starts now....


ok,in order not to be complainted later, i post my explanation as well :twisted:

Let x, y be the work/ day done by a boy and a girl respectively
have: 12x+16y= 1/5 and 13x+24y=1/4
find x, y and substitute into the equation: 7x+10y=?
get the result= 24/200 ---> the days require blah blah is 200/24= 8.333333
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 [#permalink]

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New post 04 Nov 2005, 11:38
B)...

12b+16g=1/5
13b+24b=1/4

solve for b and g...1/100...1/200...7/100+1/20=1/x...solve for x
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Director
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 [#permalink]

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New post 04 Nov 2005, 11:43
you guys only 50% right :twisted:
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 [#permalink]

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New post 04 Nov 2005, 11:46
gsr wrote:
you guys only 50% right :twisted:

:roll:
Director
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 [#permalink]

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New post 04 Nov 2005, 11:50
the other 50 % is 2 min :)
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Director
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 [#permalink]

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New post 04 Nov 2005, 11:56
bewakoof wrote:
the other 50 % is 2 min :)


You get 75% :twisted:
2 mins is what I gave you. But, how long did you actually take?
Director
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 [#permalink]

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New post 04 Nov 2005, 13:36
gsr wrote:
bewakoof wrote:
the other 50 % is 2 min :)


You get 75% :twisted:
2 mins is what I gave you. But, how long did you actually take?


it took me 2 min :).. I am 100 % right..
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  [#permalink] 04 Nov 2005, 13:36
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