If a * b = 2a - 3b + ab, then 3 * 5 + 5 * 3 is equal to?

Answer: Option A

$$\begin{array}{rl}& 3\ast 5+5\ast 3\\ & \Rightarrow 3\ast 5=2\times 3-3\times 5+3\times 5\\ & =6-15+15\\ & =6\\ & \Rightarrow 5\ast 3=2\times 5-3\times 3+3\times 5\\ & =10-9+15\\ & =16\\ & \therefore 3\ast 5+5\ast 3\\ & \Rightarrow 6+16=22\end{array}$$