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Either:

1) Find the radius of each marble and thus their volume through V = 4/3 x pi x r^3 and then add the volumes up.

or

2) Put all the marbles in a measuring jug and fill it up to the top. Pour the water into a separate container and empty the marbles out of the jug. Pour the water back into the jug. Thus:

Volume of water with marbles - volume of water without the marbles = volume of marbles

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Q: How can you calculate the volume of a sample of marbles?
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