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# Aquarium A holds 150 gallons more sea water than does Aquar

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Aquarium A holds 150 gallons more sea water than does Aquar [#permalink]  07 Jun 2017, 02:32
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Question Stats:

81% (02:27) correct 18% (01:38) wrong based on 22 sessions

Aquarium A holds 150 gallons more sea water than does Aquarium B, and both aquariums are currently filled to capacity. If 20 gallons are removed from each aquarium, then Aquarium A would hold four times as much sea water as Aquarium B holds. What is the combined total number of gallons of sea water that can be held in both aquariums?

A) 290

B) 250

C) 220

D) 200

E) 70
[Reveal] Spoiler: OA

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Re: Aquarium A holds 150 gallons more sea water than does Aquar [#permalink]  20 Sep 2017, 05:43
The statement in formulas becomes $$A=B+150$$ and $$A-20=4(B-20)$$. Substituting B from the first equation in the second one we get $$B=70$$. Substituting B back in the first equation we get $$A=220$$. Thus, the sum of the capacities is 290 and answer is A.
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Re: Aquarium A holds 150 gallons more sea water than does Aquar [#permalink]  30 Jan 2018, 23:46
Let, aquarium B holds x gallon water.
So aquarium A holds x+150 gallons.
20 gallons are removed from each aquarium, so A holds x+130 gallons and B holds x-20 gallons.
Then according to the question x+130=4*(x-20) or, x=70

B holds 70 gallons, A holds 220 gallons. Together they hold 290 gallons.
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Re: Aquarium A holds 150 gallons more sea water than does Aquar [#permalink]  03 Feb 2018, 03:58
Thank you.
Re: Aquarium A holds 150 gallons more sea water than does Aquar   [#permalink] 03 Feb 2018, 03:58
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