Georgia is sick and coughs 5 times a minute.  Her brother Robert is also sick but he coughs twice as much as her.  After 20 minutes, how many times have they coughed?
How many coughs does Robert have? ** Robert coughs twice as much as Georgia who coughs 5 times so Robert coughs 2*5 = <<10=10>>10 coughs per minute
How many times do they cough together? ** Georgia coughs 5 times and Robert coughs 10 times so together they cough 5+10 = <<5+10=15>>15 times per minute
How many coughs will they have after 20 minutes? ** After 20 minutes they will have coughed 15*20 = <<15*20=300>>300 coughs
#### 300