add all three number together and then divide by three (because there's three numbers) 21+6=27, 27+9=36, 36/3=12 12 is the answer.
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Well, darling, if you add 5, 7, and 9 together, you get 21. And since there are three numbers, you divide 21 by 3 to get an average of 7. So, the average of 5, 7, and 9 is 7. Hope that clears things up for you, sweetie!
9/6 = 21/n3/2 = 21/n Since 3 x 7 = 21, then n must be 14 (2 x 7) and we have:3/2 = 21/14 or 9/6 = 21/14.
Average = (8 + 9 + 5 + 6)/4 = 7Average = (8 + 9 + 5 + 6)/4 = 7Average = (8 + 9 + 5 + 6)/4 = 7Average = (8 + 9 + 5 + 6)/4 = 7
126
6x - 9 = 21 6x = 21 + 9 6x = 28 x = 28/6 Reduce to: x = 14/3