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Jim has identical drinking glasses, each in the shape of a right circular cylinder with an internal diameter of 3 inches. He pours milk from a gallon jug into each glass until it is full. If the height of milk in each glass is about 7 inches, what is the largest number of full milk glasses that he can pour from one gallon of milk?

(Note: There are 231 cubic inches in 1 gallon.)

Answer :

The first we have to know is the formula for the volume of a cylinder:

[tex]V=\pi\cdot r^2\cdot h[/tex]

From the question, we have that

D = 3 inches --> r = 3/2 --> r = 1.5 inches

h = 7 inches

Then, we have that the volume is:

[tex]V=\pi\cdot(1.5)^2\cdot7\Rightarrow V=49.48008\approx49.48[/tex]

Then, the cylinder (glass) has a volume of 49.48 cubic inches.

If we know that there are 231 cubic inches in a gallon, we have that:

[tex]N=\frac{231}{49.48}\Rightarrow N=4.6685\approx4.67[/tex]

Then, from the result, we can say that the largest number of full milk glasses that he can pour from one gallon of milk is 4 glasses.

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Rewritten by : Barada