SSC CGL – Combined Graduate Level Examination · प्रश्न 69
X and Y complete a task in 14 days, Y and Z in 18 days. X works 6 days, Y works 8 days, Z works 12 days to complete it. How many days for Z alone (approximate)?
उत्तर देखें और व्याख्या
उत्तर: (B) 22 days
व्याख्या
6(X + Y) + 2(Y + Z) + 10Z = 1 gives 10Z = 1 − 6/14 − 2/18, so Z = 29/630 per day, ≈ 21.7 ≈ 22 days.