Question
The average of four numbers is 68. When four more
numbers are included, the average increases by 6. Find the average of the numbers included.Solution
Sum of the 4 numbers = 68 Γ 4 = 272
New average = 68 + 6 = 74
Sum of 8 numbers = 74 Γ 8 = 592
Sum of new 4 numbers = 592 - 272 = 320
Required average = 320 Γ· 4 = 80
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