A bank of 6 cylinders has a foldable volume of 9cuft^3. How much gas does the bank contain at 2950psi?? the answer is 1815cuft^3?

Update:

The answer is one from a practice test that gives the answers after submittal. Its been a long time since Ive done anything like this and can't figure out how they arrived at that answer. If you can show your work I would be very appreciative.

Update 2:

Sorry its supposed to be floodable volume not foldable

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    Air pressure at sea level is 14.7 psi, roughly

    2950 psi / 14.7 psi = x ft^3 / 9 ft^3

    9 * 2950 / 14.7 = x

    x = 1806.122448979591836734693877551...

    They must have rounded somewhere in the problem before the final calculation.

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