Question

the average of 13 number 68 the average of first 7 in 63 and​

Answer 1

Answer:

Step-by-step explanation:

Let the sum of first 6 numbers be x

Let the seventh number be y

And the sum of last 6 numbers be z

Average of all 13 numbers= (x+y+z)/13 = 68

x+y+z= 884 ……………………..(1)

Average of first 7 numbers =(x+y)/7= 63

x+y= 441 ….…………………....(2)

Average of last 7 numbers =(y+z)/7= 70

y+z= 490 …………………………(3)

Subtract equation (2) from (1)

x+y+z-x-y = 884–441

z = 443 …………………….(4)

Substitute the value of z from eqn (4) in eqn (3)

y + 443 = 490

Thus, y = 47

Answer : The value of the seventh number is 47

Answer 2

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