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28 Jul 2014, 10:48
Kudos
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
83% (01:37) correct
17%
(02:01)
wrong
based on 238
sessions
History
Date
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Not Attempted Yet
Fred goes to a seafood market to purchase lobsters. All the lobsters he buys cost either $4 or $5. If he buys a total of 25 lobsters, and spends $112, what fraction of the lobsters that he purchased cost $5?
A) \(\frac{12}{25}\)
B) \(\frac{13}{25}\)
C) \(\frac{14}{25}\)
D) \(\frac{3}{5}\)
E) \(\frac{16}{25}\)
A) \(\frac{12}{25}\)
B) \(\frac{13}{25}\)
C) \(\frac{14}{25}\)
D) \(\frac{3}{5}\)
E) \(\frac{16}{25}\)
28 Jul 2014, 11:34
Kudos
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Gnpth
5x+ 4(25 - x) = 112 --> x = 12 --> ($5 lobsters)/(total) = x/25 = 12/25.
Answer: A.
27 Dec 2018, 10:56
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I used the answers to find the correct solution.
By looking at the answer choices and given the information, you can eliminate B & D, because an odd integer will result in an odd number when you add the two possibility of combinations together, for example:
B - 13/25 =
12 ($4 lobsters) = 12*4 = $48 + 13($5 lobsters) = 13 * $5 = 65$
$48+$65 = $113
Then test for A, using the same method above, results in $112, the correct answer
By looking at the answer choices and given the information, you can eliminate B & D, because an odd integer will result in an odd number when you add the two possibility of combinations together, for example:
B - 13/25 =
12 ($4 lobsters) = 12*4 = $48 + 13($5 lobsters) = 13 * $5 = 65$
$48+$65 = $113
Then test for A, using the same method above, results in $112, the correct answer
