UPSC Civil Services 2019 Prelims General Studies Paper II

ATQ,
x ≥ 25 ⇒ x = {25, 26, 27 ----}.
and y ≤ 40 ⇒ y = {----- 38, 39, 40}.
For (y – x) maximum, y should be maximum and x should be minimum.
(y – x) ≤ (40 – 25)
∴ (y – x) ≤ 15 .
Hence, (y – x) is away less then or equal to 15.