Question
The average of eight numbers is 50. When four more numbers
are included, the average increases by 3. Find the average of the numbers included.Solution
Sum of the 8 numbers = 50 × 8 = 400
New average = 50 + 3 = 53
Sum of 12 numbers = 53 × 12 = 636
Sum of new 4 numbers = 636 - 400 = 236
Required average = 236 ÷ 4 = 59
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