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In a refinery, the capacity of oil tank A is 70 percent of the capacit

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In a refinery, the capacity of oil tank A is 70 percent of the capacit  [#permalink]

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New post 27 Nov 2018, 06:49
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A
B
C
D
E

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  45% (medium)

Question Stats:

71% (01:32) correct 29% (01:29) wrong based on 44 sessions

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Project DS Butler: Day 22: Data Sufficiency (DS43)


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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

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In a refinery, the capacity of oil tank A is 70 percent of the capacit  [#permalink]

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New post 28 Nov 2018, 05:37
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.
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In a refinery, the capacity of oil tank A is 70 percent of the capacit &nbs [#permalink] 28 Nov 2018, 05:37
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In a refinery, the capacity of oil tank A is 70 percent of the capacit

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