Question
The average of ten numbers is 80. When five more numbers
are included, the average increases by 4. Find the average of the numbers included.Solution
Sum of the 10 numbers = 80 × 10 = 800
New average = 80 + 4 = 84
Sum of 15 numbers = 84 × 15 = 1260
Sum of new 5 numbers = 1260 - 800 = 460
Required average = 460 ÷ 5 = 92
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