Answer:
Imagine that x (ounce) is the amount of paint used to paint the flag
Base on the information, we know that:
2/3 + 3/5 + 2/15 + x = 2
x = 2 - 2/3 - 3/5 - 2/15
x = 30/15 - 10/15 - 9/15 - 2/15
x = 9/15 = 0.6 (ounce)
So the amount of paint used to paint the flag is 0.6 ounce.