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The average of one group of numbers is 4. A second group contains twice as many numbers and has an average of 10. What is the average of both groups of

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So given let s = sum so average = 4 of s is s/x =4 s = 4x similarly s₁ = sum so 2nd average = 10 of s is s/2x = 10 s₁ = 20x so average of the total numbers is

so total sum of the numbers = 20x + 4x =24x so total numbers = x+2x = 3x average = total sum/total numbers so 24x/3x = 24/3