Here is the information you are given and a corresponding equation demonstrating the relationship between the given information and the unknown.
Vtotal = Vwater + Vsand = 42cm3
Here is the given equation rearranged (by subtracting the volume of water from both sides) to target the unknown information (volume of sand).
Vsand = Vtotal - Vwater
Plugging in the given info to the equation yields your answer.
Vsand = 42 - 20
Vsand = 22cm3
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A cylinder with a radius of 6.5 centimeters and a height of 10 centimeters has a volume of 1,327.32 cubic centimeters.
a graduated cylinder
The answer depends on the cylinder.
To find the volume of an irregular object using a graduated cylinder, you can use the method of water displacement. Fill the graduated cylinder with a known volume of water, then carefully submerge the irregular object in the water. The increase in water level corresponds to the volume of the object. Subtract the initial volume from the final volume to determine the volume of the irregular object.
The volume is 62.83cm3