To make navy blue, 0.0807 cups of blue will be needed.
Ratio of blue to orange in navy blue: We know that for every 3 quarts of blue paint, we need 223 cups of orange paint to make navy blue. This translates to a ratio of blue to orange of:
ratio_blue_to_orange = 3 quarts / 223 cups = 0.013453 quarts per cup
Converting quarts to cups: Since we're dealing with 6 cups of orange paint, we need to convert the ratio of blue to orange to cups per cup:
ratio_blue_to_orange = 0.013453 quarts per cup * 4 cups per quart = 0.053812 cups per cup
Calculating the amount of blue paint needed: Now, we can simply multiply the ratio of blue to orange by the amount of orange paint (6 cups) to find the required amount of blue paint:
amount_blue_paint = ratio_blue_to_orange * amount_orange_paint = 0.053812 cups per cup * 6 cups = 0.0807 cups
Therefore, to make navy blue with 6 cups of orange paint, you will need approximately 0.0807 cups of blue paint.