Question

average of first and the second of three numbers is 20 more than average of the second and the third of these numbers what is difference between the first and the third of these three numbers​

Answer 1

Let Ist no = x

2nd no =y

3rd no = z

According to Q.

(x+y)/2 = 15 + (y+z)/2

Multiply above equation by 2

x + y = 30+y+z

So,

x-z = 30

Difference of Ist & 3rd no is 30

Hope it's helpful for you

Answer 2

Answer:

40

Step-by-step explanation:

let's take the first, second and third numbers as x, y, z respectively

from question,

(x + y)/2 = 20 + (y + z)/2

=> (x + y)/2 = (40 + y + z)/2

=> x + y = 40 + y + z

=> x = 40 + z

=> x - z = 40