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Re: A cylindrical pail has a radius of 7 inches and a height of 9 inches. [#permalink]
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Bunuel wrote:
A cylindrical pail has a radius of 7 inches and a height of 9 inches. If there are 231 cubic inches to a gallon, approximately how many gallons will this pail hold?

(A) 6
(B) 12/7
(C) 7.5
(D) 8.2
(E) 9


We can determine the volume of the pail:

volume = πr^2h

volume = π(7^2)(9) inches^3

So the number of gallons it will hold is:

[π(7^2)(9)]/231 = [π(7^2)(3)]/77 = [π(7)(3)]/11 = 21π/11 ≈ 65/11 ≈ 6

Answer: A
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Re: A cylindrical pail has a radius of 7 inches and a height of 9 inches. [#permalink]
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Re: A cylindrical pail has a radius of 7 inches and a height of 9 inches. [#permalink]
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