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# 3 cooks have to make 80 burgers.They are known to make 20

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3 cooks have to make 80 burgers.They are known to make 20  [#permalink]

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24 Jan 2018, 00:14
virtualanimosity wrote:
3 cooks have to make 80 burgers.They are known to make 20 pieces every minute working together.The 1st cook began workin alone and made 20 pieces having worked for sometime more than 3 mins.The remaining part of the work was done by second and 3rd cook working together.It took a total of 8 minutes to complete the 80 burgers.How many minutes would it take the 1st cook alone to cook 160 burgers?

A. 16 minutes
B. 24 mins
C. 32 mins
D. 40 mins
E. 30 mins

Let the time taken by A is $$t1 = \frac{20}{x}, t2 = \frac{60}{(y+z)}$$
Also, $$x + y + z = 20$$...
$$t1 + t2 = 80$$, combing all the above equations we get $$(x-10)(x-5) = 0$$ or $$x =10, 5$$
But when we substitute $$x = 5$$ in $$t1 = 20/x$$ we get t1 = 2 but t1 is greater than 3, so $$t1 = 4$$.
Hence, C.
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Re: 3 cooks have to make 80 burgers.They are known to make 20  [#permalink]

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13 Sep 2018, 20:06
virtualanimosity wrote:
3 cooks have to make 80 burgers.They are known to make 20 pieces every minute working together.The 1st cook began workin alone and made 20 pieces having worked for sometime more than 3 mins.The remaining part of the work was done by second and 3rd cook working together.It took a total of 8 minutes to complete the 80 burgers.How many minutes would it take the 1st cook alone to cook 160 burgers?

A. 16 minutes
B. 24 mins
C. 32 mins
D. 40 mins
E. 30 mins

a plane and very simple solution

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Re: 3 cooks have to make 80 burgers.They are known to make 20  [#permalink]

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13 Sep 2018, 20:08
virtualanimosity wrote:
3 cooks have to make 80 burgers.They are known to make 20 pieces every minute working together.The 1st cook began workin alone and made 20 pieces having worked for sometime more than 3 mins.The remaining part of the work was done by second and 3rd cook working together.It took a total of 8 minutes to complete the 80 burgers.How many minutes would it take the 1st cook alone to cook 160 burgers?

A. 16 minutes
B. 24 mins
C. 32 mins
D. 40 mins
E. 30 mins

Attachments

File comment: www.GMATinsight.com

Screen Shot 2018-09-14 at 9.35.05 AM.png [ 458.89 KiB | Viewed 79 times ]

_________________

Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

Re: 3 cooks have to make 80 burgers.They are known to make 20 &nbs [#permalink] 13 Sep 2018, 20:08

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