A, B, C and D are four consecutive even numbers respectively and their average is 65. What is the product of A and D?

Answer: Option C

Let x, x + 2, x + 4 and x + 6 represent numbers A, B, C and D respectively.
Then,
$$\begin{array}{rl}& \Rightarrow \frac{x+\left(x+2\right)+\left(x+4\right)+\left(x+6\right)}{4}=65\\ & \Rightarrow 4x+12=260\\ & \Rightarrow 4x=248\\ & \Rightarrow x=62\end{array}$$
So, A = 62, B = 64, C = 66, D = 68
∴ A × D = 62 × 68 = 4216