The average of 50 numbers id 20. If two numbers, namely 45 and 55 are discarded, the average of the remaining numbers is :	Select:
A) 22.75
B) 33.25
C) 22.25
D) 11.75
E) 18.75

Rationale: "explanation : total of 50 numbers = ( 50 × 20 ) = 1000 total of 48 numbers = ( 1000 - ( 45 + 55 ) ] = 900 required average = 900 / 48 = 18.75 answer : e"
Answer: E