Question

a no is as much greater than 21 as it is less than 71 .find the no

Answer 1

Let number is X greater than 21 and X less than 71.
Now according to question,
21 +X = 71 - X
2X = 50
X = 25
So, Required number is 21+X = 21 +25 = 46.

Alternatively,
The required number would be the average or mean of 21 and 71. So
Required number = (21 +71)/2 = 46.

Answer 2

let the no. be x
so x+21 = x-71
21+71=x-x
92=x