John decides to buy some birds.  He got 50 dollars from each of his 4 grandparents.  If each bird costs $20, how many wings did all the birds have?
He got 4*50=$<<4*50=200>>200
That means he was able to buy 200/20=<<200/20=10>>10 birds
Since each bird has 2 wings he got 10*2=<<10*2=20>>20 wings
#### 20