Q. The average of 11 results is 50. If the average of the first six results is 49 and that of the last six is 52, the sixth no. is
✅ Correct Answer: (D)
56
Explanation: Here , Sum of 11 results = 50 × 11 = 550
Sum of the first six results = 49 × 6 = 294
and Sum of the last six results = 52 × 6 = 312
∴ Sixth result = Sum of the first six results + Sum of the last six results – Sum of 11 results
Sixth result = 294 + 312 – 550 = 56
Explanation by: Parvesh Kanani
Here , Sum of 11 results = 50 × 11 = 550
Sum of the first six results = 49 × 6 = 294
and Sum of the last six results = 52 × 6 = 312
∴ Sixth result = Sum of the first six results + Sum of the last six results – Sum of 11 results
Sixth result = 294 + 312 – 550 = 56
Sum of the first six results = 49 × 6 = 294
and Sum of the last six results = 52 × 6 = 312
∴ Sixth result = Sum of the first six results + Sum of the last six results – Sum of 11 results
Sixth result = 294 + 312 – 550 = 56