Mark collects money for the homeless.  He visits 20 households a day for 5 days and half of those households give him a pair of 20s.  How much did he collect?
He got money from 20/2=<<20/2=10>>10 households per day
So that means he got money from 10*5=<<10*5=50>>50 households
Each of those houses gave 20*2=$<<20*2=40>>40
So he raised 40*50=$<<40*50=2000>>2000
#### 2000