###Human: Ryan has 40 balls. There are twice as many red balls as blue while the rest are green. If there are 11 blue balls, how many green balls are there?, ### Assistant: There are 11 blue x 2 red/blue = 22 red balls.
The total number of blue and red balls is 11 blue + 22 red = 33 balls
There are 40 balls - 33 balls = 7 green balls. 
 So the answer is :  7