Answer:
Purple paint = 1 quart
Step-by-step explanation:
Red paint = 1/9 quart
Blue paint = 8/9 quart
Purple paint = Red paint + blue paint
= 1/9 quart + 8/9 quart
= (1+8)/9 quart
= 9/9 quart
= 1 quart
Purple paint = 1 quart
The painter made 1 quart of purple paint.