Question 1180265
Let T = the total number of buttons
Then the number of green = T/2 and the number of blue = T/3
Thus R + T/2 + T/3 = T -> R = T/6
Since G - R = 20 -> T/2 = T/6 + 20 -> T = 60
Therefore, the fraction that are red = 60/6 = 10