<p>Take 15 oz of each dye.</p>
<p>In an orange dye
red:yellow = 3:2 = 9oz:6oz</p>
<p>In a green dye
blue:yellow = 2:1 = 10oz:5oz</p>
<p>++++++++++++</p>
<p>Combining the two dyes will result in 30oz of mix containing
6oz + 5oz =11oz of yellow dye.</p>
<p>11oz is 11/30 of 30oz.</p>