If 0.764 B = 1.236 A, then what is the value of (B - A)/(B + A)?

Given, 0.764 B = 1.236 A
⇒ B/A = 1.236 / 0.764
Now, (B - A)/(B + A) = (B/A - 1) / (B/A + 1)
= (1.236/0.764 - 1) / (1.236/0.764 + 1)
= (1.236 - 0.764)/(1.236 + 0.764)
= 0.472/2.000
= 0.236