Simplify the ratio 100:120

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

The radius of a sphere is 3 inches. which represents the volume of the sphere?