Answer:
He used 77 ounces of blue paint
Explanation:
In this question, we are to calculate the ounces of blue paint used based on the ratio in the question.
Firstly we add all the ratios together
This gives; 10 + 22 + 4 + 18 = 54
The ratio that represents that of the blue paint is 22;
Thus the number of ounces of blue paints used is; 22/54 * 189 = 77 ounces