Chapter 1 - Section 1.7 - Problem Solving: Interest, Mixture, Uniform Motion, Constant Rate Job Applications - 1.7 Asses Your Understanding - Page 141: 26

We need 10 candies of the first kind, 20 of the second kind.

Let $x$ be the number of candies of the first kind, then $30-x$ is the amount of the second kind. Then our equation is: $0.45x+0.25\cdot(30-x)=9.5\\0.45x+7.5-0.25x=9.5\\0.2x=2\\x=10$ Thus we need 10 candies of the first kind, 20 of the second kind.