The average of 8 numbers is 20, the average of the first two numbers is 15 and that of the next three is 21 If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is

(a) 18 (b) 22 (c) 25 (d) 27

The average of 8 numbers is 20, the average of the first two numbers is 15 and that of the next three is 21 If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is

(a) 18 (b) 22 (c) 25 (d) 27

1 Answer

127 votes

Let the eighth numbers be then, sixth number =

Seventh number =

So,

127 votes

127