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

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

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New post 22 Feb 2017, 23:21
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

65% (00:42) correct 35% (00:57) wrong based on 17 sessions

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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, [#permalink]

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New post 23 Feb 2017, 03:46
(1) B + W = 17;
8B + 6W = 120;

Solving the two equations: 2B = 18;
So one can get the number of black and white rats. Hence, Sufficient.

(2)
There are 8 white rats;
Therefore, 6*8 + 8B = 120; Hence, Sufficient.

Answer D

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Re: At a laboratory, white rats are fed 6 pellets of food per day,   [#permalink] 23 Feb 2017, 03:46
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At a laboratory, white rats are fed 6 pellets of food per day,

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