In the unknown ratio<span>, you only know one of the numbers. To </span>solve<span> for the unknown number, set up a proportion with the known </span>ratio<span> on one side and the unknown </span>ratio<span> on the other, cross multiply, and </span>solve<span> the resulting equation.</span>
2d-5+5=17+5
2d=22
d=22/2
d=11
<span>9r - 2 = 16
9r = 16 + 2
9r = 18
r = 2
Answer : B) 2</span>