Given that ABCD is a rational number, the absolute value of (a-b) is less than or equal to 9, the absolute value of (C-D) is less than or equal to 16, and the absolute value of (a-b - + D) is 25, find the absolute value of (- a)

Given that ABCD is a rational number, the absolute value of (a-b) is less than or equal to 9, the absolute value of (C-D) is less than or equal to 16, and the absolute value of (a-b - + D) is 25, find the absolute value of (- a)

|a-b-c+d|=|(a-b)-(c-d)|≤|a-b|+|c-d|≤9+16=25
But | a-b-c + D | = 25
So, | A-B | = 9
|c-d|=16
Insufficient conditions for finding the absolute value of (- a)