9th Grade Science Question Help?

Question:My brother has the following question on his 9th grade science homework. It's a teacher-typed page and not from the book. I can't figure it out. Any help would be greatly appreciated.

7. A barge has the dimensions of 25m by 10m and a height of 6m. What mass do the makers have to make it in order for it to float in fresh water?

volume=length times width times height.



the density of water is 1 g/cm^3. so.


therefore, the mass would have to be 1500.

I'm pretty sure that's right. It's been awhile.

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