Bunuel wrote:

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

Let A & B be the capacity of Aquarium A & B respectively.

We have A = B + 150.....(I)

Now 20 gallons is removed from each tank & new relationship between A & B is

A - 20 = 4*(B - 20)........(II)

Solving (I) & (II), we get

B = 70 & A = 220

Hence Combined capacity, A + B = 290 gallons

Answer A.

Thanks,

GyM