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At a laboratory, white rats are fed 6 pellets of food per day, and bla

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At a laboratory, white rats are fed 6 pellets of food per day, and bla  [#permalink]

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At a laboratory, white rats are fed 6 pellets of food per day, and black rats are fed 8 pellets of food per day. If the laboratory fed a total of 120 pellets of food to white and black rats on a certain day, were more black rats than white rats fed?

(1) There are a total of 17 rats.
(2) There are 8 white rats.

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Re: At a laboratory, white rats are fed 6 pellets of food per day, and bla  [#permalink]

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New post 15 Jul 2018, 20:50
Bunuel wrote:
At a laboratory, white rats are fed 6 pellets of food per day, and black rats are fed 8 pellets of food per day. If the laboratory fed a total of 120 pellets of food to white and black rats on a certain day, were more black rats than white rats fed?

(1) There are a total of 17 rats.
(2) There are 8 white rats.


Given, 8B+6W=120

st1:- B+W=17

2 equations & two variables; so we can determine B & W, hence sufficient.

St2:- W=8,
SO, we can substitute & determine B, subsequently W.
Hence sufficient.

ANS. (D)
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Re: At a laboratory, white rats are fed 6 pellets of food per day, and bla &nbs [#permalink] 15 Jul 2018, 20:50
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