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