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29 Apr 2025, 00:30
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D
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Difficulty:
25%
(medium)
Question Stats:
84% (01:25) correct
16%
(01:44)
wrong
based on 55
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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.
(1) There are a total of 17 rats.
(2) There are 8 white rats.
29 Apr 2025, 01:16
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6w + 8b = 120 - (eqn 1)
b>w?
Statement 1
w+b = 17 - (eqn 2)
We can use eqn 1 and 2 to calculate values of b and w to identify if b>w
Sufficient
Statement 2
w = 8
We can substitute this in egn 1 to calculate b and then compare to identify if b>w
Sufficient
b>w?
Statement 1
w+b = 17 - (eqn 2)
We can use eqn 1 and 2 to calculate values of b and w to identify if b>w
Sufficient
Statement 2
w = 8
We can substitute this in egn 1 to calculate b and then compare to identify if b>w
Sufficient
Bunuel
29 Apr 2025, 13:45
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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?
6w+8b=120 .....3w+4b=60 ......(1)
(1) There are a total of 17 rats.
w+b=17......(2)
Solving (1)&(2), we get b=9 & w=8
Sufficient
(2) There are 8 white rats.
w=8
Put it in (1) to get b; b=9
Sufficient
Answer: D
6w+8b=120 .....3w+4b=60 ......(1)
(1) There are a total of 17 rats.
w+b=17......(2)
Solving (1)&(2), we get b=9 & w=8
Sufficient
(2) There are 8 white rats.
w=8
Put it in (1) to get b; b=9
Sufficient
Answer: D
