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Length x Width x Height
Measure all 3 and multiply
5 x 2 x 1 = 10

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V : Before adding the 3 marbles : 20ml
V: After adding the 3 marbles: 25ml
Difference in V : of the 3 marbles : 5ml

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# of drops to 11ml : 40
# of drops to 12 ml : 80
# of drops to 13 ml: 120
Average : 40

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Add 20ml to a 100ml graduated cylinder. Then add 3 marbles to the cylinder and figure out how much water it displaces. Figure out how much water was in it before adding the marbles and after and the difference.

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Get a 25ml beaker of water and an eye dropper. Fill it to 10ml of water and then figure out how many drops it takes to get to 11ml. Then to 12ml 13ml and then find out the average.

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to find out how much a space is occupied

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The amount of space that a substance or object occupies, or that is enclosed within a container, especially when great.

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Count your drops !