Question 932133
x the number of yellow
$13.50x + $9.95(17-x) = $211.75
x = (211.75-17•9.95)/3.55 = 12 the number of yellow.  White: 5 {{{17-12}}}
And...checking
12•$13.50 + 5•$9.95 = 211.75
Will Leave the checking calculation to You.