300
Shelby bought a 2-ounce tube of blue paint. She used 2/3 ounce to paint the water, 3/5 ounce to paint the sky, and some to paint a flag. After that, she had 2/15 ounce left. How much paint did Shelby use to paint her flag?
Shelby used 9/15 ounce to paint the flag.