ATQ, Total work = 72 units (LCM of 24 and 18) Inlet efficiency = 3 units Outlet efficiency = -4 units Total efficiency of inlet = 8 × 3 = 24 units Total efficiency of outlet = -4 (x – 4) = (16 – 4x) units ATQ: => (24 + 16 – 4x) × 9 = 72 => (40 – 4x) = 72/9 => 4x = 40 – 8 => x = 8