An artist uses four distinct colors in his latest painting-red, blue, green, and yellow - with ounces used in a ratio of 10:22:4:18, respectively. The artist used a total of 189 ounces of paint to complete the piece. How many ounces of blue paint did he use?

He used 77 ounces of blue paint

Step-by-step 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