word problem scientific notation

Question

the mass of Neptune is about 1x10^26 kilograms.  The mass of Jupiter is about 2x10^27 kilograms.  Approximately how many times heavier is Jupiter than Neptune?  

 

The answer given is 20, but I don't know how to do the work.

Answer 1

Andrea,

 

The Mass of Jupiter/(Mass of Neptune) will give you the answer regarding how heavier is Jupiter than Neptune

 

In this case is is 2*10^27/(1*10^26) = 20