Question

Of a set of 30 numbers, average of first 10 numbers = average of last 20 numbers. Then the sum of the last 20 numbers is ?
(a)2 X sum of first ten numbers
(b)2 X sum of last ten numbers
(c)Sum of first ten numbers
(d)Cannot be determined with given data; Of a set of 30 numbers, average of first 10 numbers = average of last 20 numbers. Then the sum of the last 20 numbers is ?; (a)2 X sum of first ten numbers; (b)2 X sum of last ten numbers; (c)Sum of first ten numbers; (d)Cannot be determined with given data

Answer 1

Answer:

K

Step-by-step explanation:

Let the sum of first 10 nos be x and last 20 nos be y

Average of 10 nos = average of 20 nos

x/10=y/20

y=x/10 x 20

y=2x

Option 'a' is the correct ans