Question

In seven given numbers, the average of first four
numbers is 4 and that of last four numbers is also 4. If the
average of these seven numbers is 3, the fourth number
is ​

Answer 1

Answer:

numbers is 4 and that of last four numbers is also 4. If the

average of these seven numbers is 3, the fourth number

is

Answer 2

Answer:

11

Step-by-step explanation:

A + B + C + D + E + F + G are the seven numbers.

(A + B + C + D + E + F + G)/7 = 3

(A + B + C + D + E + F + G) = 21

(A + B + C + D)/4 = 4

A + B +C + D = 16

A + B +C = 16 - D

(D+ E+ F+ G)/4 = 4

D + E + F + G = 16

E + F + G = 16 - D

(A + B + C) + D + (E + F + G) = 21

(16 - D) + D + (16 - D) = 21

32 - D = 21

- D = 21 - 32

- D = - 11

D = 11

The fourth number is 11.