Question
The average of four numbers is 58. When four more numbers
are included, the average increases by 4. Find the average of the numbers included.Solution
Sum of the 4 numbers = 58 × 4 = 232
New average = 58 + 4 = 62
Sum of 8 numbers = 62 × 8 = 496
Sum of new 4 numbers = 496 - 232 = 264
Required average = 264 ÷ 4 = 66
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