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27 Nov 2018, 07:49
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
77% (01:24) correct
23%
(01:27)
wrong
based on 833
sessions
History
Date
Time
Result
Not Attempted Yet
In a refinery, the capacity of oil tank A is 70 percent of the capacity of oil tank B. How many more gallons of oil are in tank A than in tank B?
1) Tank A is 90 percent full; tank B is 50 percent full
2) When full, tank A contains 50,000 gallons of oil
1) Tank A is 90 percent full; tank B is 50 percent full
2) When full, tank A contains 50,000 gallons of oil
28 Nov 2018, 06:37
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Answer is C.
From the stimulus, I get the equoation; A=0.7B
1) 90% full means 0.9A / 50% full means 0.5B
(Not sufficient) cannot get the gallon as we don't know amount of A or B
2) A= 50,000
(Not sufficient) cannot compare A with B, only with the amount
1) & 2) Sufficient
0.9A = 0.9 * 50,000 = 45,000
also, 0.9A = 0.9 * 0.7B = 0.63B, which equals to 45,000, then B = 45,000 / 0.63
As we could calculate both A & B, we could campare them by numbers.
From the stimulus, I get the equoation; A=0.7B
1) 90% full means 0.9A / 50% full means 0.5B
(Not sufficient) cannot get the gallon as we don't know amount of A or B
2) A= 50,000
(Not sufficient) cannot compare A with B, only with the amount
1) & 2) Sufficient
0.9A = 0.9 * 50,000 = 45,000
also, 0.9A = 0.9 * 0.7B = 0.63B, which equals to 45,000, then B = 45,000 / 0.63
As we could calculate both A & B, we could campare them by numbers.
01 Dec 2020, 11:37
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GMATBusters
Given: In a refinery, the capacity of oil tank A is 70 percent of the capacity of oil tank B.
Let A = the capacity of oil tank A
So, 0.7A = the capacity of oil tank B
Target question: How many more gallons of oil are in tank A than in tank B?
Statement 1: Tank A is 90 percent full; tank B is 50 percent full
This means 0.9A = the volume of oil in tank A
And 0.5(0.7A) = the volume of oil in tank B
In other words, 0.35A = the volume of oil in tank B
To answer the target question, we need to calculate the value of 0.9A - 0.35A
Since we don't know the value of A, there's no way to calculate 0.9A - 0.35A
Statement 1 is NOT SUFFICIENT
Statement 2: When full, tank A contains 50,000 gallons of oil
In other words, A = 50,000
Clearly NOT SUFFICIENT
Statements 1 and 2 combined
Statement 1 tells us that the answer the target question is 0.9A - 0.35A
Statement 2 tells us that A = 50,000
Since we COULD plug A = 50,000 into the expression 0.9A - 0.35A, we COULD answer the target question with certainty.
So, the combined statements are SUFFICIENT
Answer: C
Cheers,
Brent
