Divide the quarts of white paint by the quarts of red paint:
20 / 4 = 5
25 / 5 = 5
35 / 7 = 5
40 / 8 = 5
All the answers are 5.
Because the quarts of white paint is the higher number the ratio would be 1 quart of red to 5 quarts of white, which would be written as 1:5.
The answer is: It is 1:5