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

a + 4

Let the numbers a,b,c,d,e are = 3,5,7,9,11

Average = \(\frac{Sum \; of \; numbers}{Total \; number \; of \; numbers}\)

              =  \(\frac{ 3 + 5 + 7 + 9 + 11}{5}\) = 7

Now verify from options = Choose option (a + 4)

Here a = 3

a + 4 = 3 + 4 = 7 verified

Ans. = (a + 4)