James has 20 pairs of red socks and half as many black socks.  He has twice as many white socks as red and black combined.  How many total socks does he have combined?
He has 20/2=<<20/2=10>>10 black socks
So he has 20+10=<<20+10=30>>30 black and red socks
So he has 30*2=<<30*2=60>>60 white socks
So he has 60+30=<<60+30=90>>90 total socks
#### 90