Of a set of 30 numbers, average of 1st 10 numbers is equal to average of last 20 numbers. The sum of last 20 numbers is?
Select the correct option:
A) 2 x sum of 1st 60 numbers
B) 2 x sum of 1st 10 numbers
C) 2 x sum of 1st 30 numbers
D) 2 x sum of 1st 20 numbers
E) 6 x sum of 1st 10 numbers
Let average of first 10 numbers is a. Then sum = 10a   Average of last 10 nmbers also a. Then their sum = 20a   From the options 2 x sum of 1st 10 numbers correct   Answer:2 x sum of 1st 10 numbers
<result>B</result>
Of a set of 30 numbers, average of 1st 10 numbers is equal to average of last 20 numbers. The sum of last 20 numbers is?