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# Maths Scale Factor and Mass Question watch

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1. I got this question to do and I really don't understand how I'm meant to do it as I' don't know how to deal with mass in relation to scale factors, only volume, surface area and length.

Two spheres have surface areas of 4cm^2 and 9cm^2.
The mass of the smaller sphere is 45g.
Find the mass of the larger sphere.

Any help would be good ^_^
2. (Original post by NolzaNatalie21)
I got this question to do and I really don't understand how I'm meant to do it as I' don't know how to deal with mass in relation to scale factors, only volume, surface area and length.

Two spheres have surface areas of 4cm^2 and 9cm^2.
The mass of the smaller sphere is 45g.
Find the mass of the larger sphere.

Any help would be good ^_^
Mass is directly proportional to volume. So the mass will increase by the same factor as the volume if the two spheres have the same density.
3. (Original post by 16Characters....)
Mass is directly proportional to volume. So the mass will increase by the same factor as the volume if the two spheres have the same density.
Thank you

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