If a, b, c, d, e are five consecutive odd numbers, their average is :

Answer: Option D

Let five consecutive odd numbers are 1, 3, 5, 7, 9
Here, a = 1, b = 3, c = 5, d = 7, e = 9
According to the question,
Average
$$\begin{array}{rl}& =\frac{1+2+5+7+9}{5}\\ & =\frac{25}{5}\\ & =5\end{array}$$
Now check the option
Option (D) a + 4
Here a = 1
1 + 4 = 5 satisfy