Question

The average of three numbers is twice the fourth. If the average of these four numbers is 28,
find fourth number.​

Answer 1

Answer:

16

Step-by-step explanation:

Let the fourth number be x

So average of first three numbers will be 2x

sum of first three numbers is 2x×3=6x

Average of all four numbers =sum of all numbers /total number

28=6x+x/4

7x=28×4

x=28×4/7

x=4×4

x=16

so the fourth number is 16

Answer 2

Answer:

18

Proof,

a,b,c,d are 4 numbers. d is the fourth in the series.

Given,

(a+b+c+d)/4=24

(a+b+c+d)=24*4

(a+b+c+d)=96 (i)

Given,

(a+b+c)/3=26

(a+b+c)=26*3

(a+b+c)=78 (ii)

Now,

(ii) -> (i)

(78 + d) = 96

d = 96 - 78

d=18

Since d is the fourth number in the series, the fourth number is 18.

Step-by-step explanation:

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