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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
24x/3x = 24/3

so the average is 8
2 4 2
2nd group has 2x members
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