the average of x,x+3,x+6,x+9 and x+12 is 10 find the value of x
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average = sum of observation / No.of observation
10 = x+(x+3)+(x+6)+(x+9)+(x+12)/5
10×5 = 5x+30
50= 5x+30
50-30 = 5x
20/5 = x
4 = x
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