Question 349502
(5/A) + (5/B) = 1 ___ 5B + 5A = AB ___ 5B = AB - 5A ___ 5B = A(B-5) ___ 5B / (B-5) = A


(20/B) - (20/A) = 1 ___ (20/B) - {20 / [5B / (B-5)]} = 1 ___ 100 - 20B + 100 = 5B ___ 200 = 25B ___ 8 = B


A = (5 * 8) / (8 - 5) = 40/3