Exams › IBPS PO › Quantitative Aptitude
The average of seven numbers is 45. We replace two numbers, 65 and 54, with 56 and 35. Find the new average.
- 41
- 43
- 47
- 45
Correct answer: 41
Solution
The original sum is 7 × 45 = 315. Replacing 65 and 54 with 56 and 35 changes the sum by (56 + 35) - (65 + 54) = 91 - 119 = -28, so the new sum is 287 and the new average is 287/7 = 41.
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