Adanna had a glass cylinder with a diameter of 23 cm and a height of 10 cm. She placed 240 marbles, each with a diameter of 1.2 cm, into the cylinder. She filled the rest of the cylinder with colored water.How many cubic centimeters of colored water did she use? Use 3.14 to approximate pi and round your answer to one decimal place.

Question

welshfella · Answer

first calculate the volume of the cylinder 
V = 3.14*r^2*h                                             where h = radius and h = height

welshfella · Answer

the the volume of the 240 marbles
volume of 1 marble  = (4/3)*3.14*r^3    where r = radius of the marble

welshfella · Answer

you are given the diameters 
radius = half of the diameter

welshfella · Answer

* first post should be r = radius

anonymous · Answer

I followed all the steps and got 3 different answers "1.3939.6, 3935.7, and 3935.6."

welshfella · Answer

what did you get for the volume of the glass cylinder?

welshfella · Answer

volume of the water = volume of cylinder - volume of the 240 marbles

anonymous · Answer

for the volume I got4152.65

welshfella · Answer

thats right

welshfella · Answer

and the volume of the 240 marbles  ?

anonymous · Answer

I got 217.0368

welshfella · Answer

yes thats right too

welshfella · Answer

I got 3935.6 for vol of water