the average of 5 consecutive odd numbers is 55 . what is the difference between the highest and lowest numbers ?  Options:
A) 2
B) 5
C) 8
D) 9
E) 10

Rationale: explanation : let the numbers be x , x + 2 , x + 4 , x + 6 and x + 8 . then , ( x + ( x + 2 ) + ( x + 4 ) + ( x + 6 ) + ( x + 8 ) ) / 5 = 55 5 x + 20 = 275 x = 255 / 5 = 51 . so , required difference = ( 51 + 8 ) 51 = 8 answer : c
Answer: C