Well, darling, to calculate the volume of a sample of marbles, you can use the formula for the volume of a sphere, which is 4/3 * π * r^3, where r is the radius of the marble. Measure the diameter of the marble, divide it by 2 to get the radius, plug it into the formula, and voila! You've got the volume of those little round troublemakers.
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Oh, dude, calculating the volume of a sample of marbles is like, super easy. You just measure the diameter of a marble, cube it, multiply by pi, divide by 6, and then multiply by the number of marbles in your sample. But hey, who needs math when you can just eyeball it and call it a day, am I right?
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
Density of a substance = (mass of a sample of the substance) divided by (volume of the same sample)
If the marbles are identical, the volume is the same. If you want, you can use different units and it looks like the volume is different.
Find the volume of the sample (Length times width times height) and multipy by the density coefficient.
If you only know mass, you don't have enough information to calculate density.You also need to know the volume of the piece that has that mass.Once you have both of those numbers, the density is(Mass) divided by (Volume)of the same sample.
20% of 50 marbles is 1 fifth of the marbles in the bag. so 50 marbles divided by 5 =10 blue marbles